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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

[X] Annual report pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934 [No Fee Required]
For the year ended December 31, 1999 or

[ ] Transition report pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934 [No Fee Required]
For the transition period from
________________to___________________
Commission File Number 0-19116

DEAN WITTER DIVERSIFIED FUTURES FUND III L.P.

(Exact name of registrant as specified in its Limited Partnership
Agreement)

DELAWARE 13-3577501
(State or other jurisdiction of
(I.R.S. Employer
incorporation or organization)
Identification No.)

c/o Demeter Management Corporation
Two World Trade Center, - 62nd Flr. New York, N.Y.
10048 (Address of principal executive offices)
(Zip Code)
Registrant's telephone number, including area code
(212) 392-5454

Securities registered pursuant to Section 12(b) of the Act:

Name of each
exchange
Title of each class
on which registered
None None

Securities registered pursuant to Section 12(g) of the Act:

Units of Limited Partnership Interest

(Title of Class)

Indicate by check-mark whether the registrant (1) has filed
all reports required to be filed by Section 13 or 15(d) of the
Securities Exchange Act of 1934 during the preceding 12 months
(or for such shorter period that the registrant was required to
file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes X No
Indicate by check-mark if disclosure of delinquent filers
pursuant to Item 405 of Regulation S-K (section 229.405 of this
chapter) is not contained herein, and will not be contained, to
the best of registrant's knowledge, in definitive proxy or
information statements incorporated by reference in Part III of
this Form 10-K or any amendment of this Form 10-K. [X]

State the aggregate market value of the Units of Limited
Partnership Interest held by non-affiliates of the registrant.
The aggregate market value shall be computed by reference to the
price at which units were sold as of a specified date within 60
days prior to the date of filing: $47,374,228 at January 31,
2000.

DOCUMENTS INCORPORATED BY REFERENCE
(See Page 1)




DEAN WITTER DIVERSIFIED FUTURES FUND III L.P.
INDEX TO ANNUAL REPORT ON FORM 10-K
DECEMBER 31, 1999


Page No.


DOCUMENTS INCORPORATED BY REFERENCE. . . . . . . . . . . . . . .
. . . . . 1

Part I .

Item 1. Business. . . . . . . . . . . . . . . . . . . . . .
. . . 2-4

Item 2. Properties. . . . . . . . . . . . . . . . . . . . . . .
. 4

Item 3. Legal Proceedings. . . . . . . . . . . . . . . . . . .
. 4-6

Item 4. Submission of Matters to a Vote of Security Holders . .
. . 6
Part II.

Item 5. Market for the Registrant's Limited Partnership
Interests and Related Security Holder Matters . . . . .
. . 7

Item 6. Selected Financial Data . . . . . . . . . . . . . . . .
. . 8

Item 7. Management's Discussion and Analysis of Financial
Condition and Results of Operations. . . . . . . . .
. . .9-21

Item 7A. Quantitative
and Qualitative Disclosures About
Market Risk . . . . . . . . . . . . . . . . . . . .
. . .21-33

Item 8. Financial Statements and Supplementary Data. . . . . .
. 33-34

Item 9. Changes in and Disagreements With Accountants on
Accounting and Financial Disclosure. . . . . . . . . .
. . 34
Part III.
Item10. Directors and Executive Officers of the Registrant .
. . 35-39

Item11. Executive Compensation . . . . . . . . . . . . . . . .
. . 39

Item12. Security Ownership of Certain Beneficial Owners
and Management . . . . . . . . . . . . . . . . . .
. . . 39

Item13. Certain Relationships and Related Transactions . .
. . . . 40
Part IV.

Item14. Exhibits, Financial Statement Schedules, and
Reports on Form 8-K . . . . . . . . . . . . . . . . . .
. . 41





DOCUMENTS INCORPORATED BY REFERENCE


Portions of the following documents are incorporated by reference
as follows:



Documents Incorporated Part of
Form 10-K

Partnership's Prospectus dated
June 30, 1992. I and IV

Annual Report to Dean Witter
Diversified Futures Fund III L.P.
Limited Partners for the year
ended December 31, 1999 II, III
and IV




























PART I

Item 1. BUSINESS

(a) General Development of Business. Dean Witter Diversified

Futures Fund III L.P. (the "Partnership") is a Delaware limited

partnership organized to engage primarily in the speculative

trading of commodity futures and forward contracts, physical

commodities, and other commodity interests (collectively,

"futures interests").



The general partner for the Partnership is Demeter Management

Corporation ("Demeter"). The non-clearing commodity broker is

Dean Witter Reynolds Inc. ("DWR"), and an unaffiliated clearing

commodity broker, Carr Futures Inc. ("Carr"), provides clearing

and execution services. The trading manager is Dean Witter

Futures & Currency Management Inc. ("DWFCM" or the "Trading

Manager"). Demeter, DWR and DWFCM are wholly-owned subsidiaries

of Morgan Stanley Dean Witter & Co. ("MSDW").



The Partnership's Net Asset Value per unit of limited partnership

interest ("Unit(s)"), as of December 31, 1999, was $1,595.11,

representing a loss of 10.6 percent from the Net Asset Value per

Unit of $1,783.35 at December 31, 1998. For a more detailed

description of the Partnership's business see subparagraph (c).







(b) Financial Information about Industry Segments. For financial

information reporting purposes, the Partnership is deemed to

engage in one industry segment, the speculative trading of

futures interests. The relevant financial information is

presented in Items 6 and 8.



(c) Narrative Description of Business. The Partnership is in the

business of speculative trading of futures interests, pursuant to

trading instructions provided by the Trading Manager. For a

detailed description of the different facets of the Partnership's

business, see those portions of the Partnership's latest

Prospectus, dated June 30, 1992 (the "Prospectus"), incorporated

by reference in this Form 10-K, set forth below:

Facets of Business

1. Summary 1. "Summary of the Prospectus"
(Pages 1-8).

2. Commodity Markets 2. "The Commodities Markets"
(Pages 52-59).

3. Partnership's Commodity 3. "Trading Policies" (Pages
Trading Arrangements and 48-49). "The Trading
Policies Manager" (Pages 37-47).

4. Management of the Part- 4. "The Management
Agreement"
nership (Pages 50-52). "The
General Partner" (Pages 33-35)
and "The Commodity Broker"
(Pages 49-50). "The
Limited Partner- ship
Agreement" (Pages
61-65).




5. Taxation of the Partner- 5. "Federal Income Tax
ship's Limited Partners Aspects" and "State and
Local Income Tax Aspects" (Pages 70-77).

(d) Financial Information About Foreign and Domestic Operations
and Export Sales.

The Partnership has not engaged in any operations in foreign

countries; however, the Partnership (through the commodity

brokers) enters into forward contract transactions where foreign

banks are the contracting party and trades in futures interests

on foreign exchanges.


Item 2. PROPERTIES
The executive and administrative offices are located within the

offices of DWR. The DWR offices utilized by the Partnership are

located at Two World Trade Center, 62nd Floor, New York, NY

10048.



Item 3. LEGAL PROCEEDINGS

The class actions first filed in 1996 in California and in New

York State courts were each dismissed in 1999. However, in the

New York State class action, plaintiffs appealed the trial

court's dismissal of their case on March 3, 2000.



On September 6, 10, and 20, 1996, and on March 13, 1997,

purported class actions were filed in the Superior Court of the

State of California, County of Los Angeles, on behalf of all

purchasers of interests in limited partnership





commodity pools sold by DWR. Named defendants include DWR,

Demeter, DWFCM, MSDW, the Partnership, certain limited

partnership commodity pools of which Demeter is the general

partner (all such parties referred to hereafter as the "Morgan

Stanley Dean Witter Parties") and certain trading advisors to

those pools. On June 16, 1997, the plaintiffs in the above

actions filed a consolidated amended complaint, alleging, among

other things, that the defendants committed fraud, deceit,

negligent misrepresentation, various violations of the California

Corporations Code, intentional and negligent breach of fiduciary

duty, fraudulent and unfair business practices, unjust

enrichment, and conversion in the sale and operation of the

various limited partnership commodity pools. The complaints seek

unspecified amounts of compensatory and punitive damages and

other relief. The court entered an order denying class

certification on August 24, 1999. On September 24, 1999, the

court entered an order dismissing the case without prejudice on

consent. Similar purported class actions were also filed on

September 18 and 20, 1996, in the Supreme Court of the State of

New York, New York County, and on November 14, 1996 in the

Superior Court of the State of Delaware, New Castle County,

against the Morgan Stanley Dean Witter Parties and certain

trading advisors on behalf of all purchasers of interests in

various limited partnership commodity pools, including the

Partnership, sold by DWR. A consolidated and amended complaint in

the action pending in the Supreme Court of the State of New York

was filed on August 13, 1997, alleging that the defendants

committed fraud,





breach of fiduciary duty, and negligent misrepresentation in the

sale and operation of the various limited partnership commodity

pools. The complaints seek unspecified amounts of compensatory

and punitive damages and other relief. The New York Supreme

Court dismissed the New York action in November 1998, but granted

plaintiffs leave to file an amended complaint, which they did in

early December 1998. The defendants filed a motion to dismiss

the amended complaint with prejudice on February 1, 1999. By

decision dated December 21, 1999, the New York Supreme Court

dismissed the case with prejudice.



In addition, on December 16, 1997, upon motion of the plaintiffs,

the action pending in the Superior Court of the State of Delaware

was voluntarily dismissed without prejudice.



Item 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

None.

















PART II

Item 5. MARKET FOR THE REGISTRANT'S LIMITED PARTNERSHIP
INTERESTS AND RELATED SECURITY HOLDER MATTERS

(a) Market Information

There is no established public trading market for Units of the

Partnership.

(b) Holders

The number of holders of Units at December 31, 1999 was

approximately 4,343.

(c) Distributions

No distributions have been made by the Partnership since it

commenced trading operations on November 1, 1990. Demeter has

sole discretion to decide what distributions, if any, shall be

made to investors in the Partnership. Demeter currently does not

intend to make any distribution of Partnership profits.


























Item 6. SELECTED FINANCIAL DATA (in dollars)








For the Years Ended December 31,
1999 1998 1997 1996
1995


Total Revenues
(including interest) (1,033,483) 9,448,680 16,870,923 4,036,681
10,909,439



Net Income (Loss) (6,483,053) 3,166,040 8,729,367
(5,408,768) (3,937,613)

Net Income (Loss)
Per Unit (Limited
& General Partners) (188.24) 91.27 185.19 (74.86)
(66.26)


Total Assets 49,917,104 65,687,386 73,774,146 81,320,352
102,412,462


Total Limited
Partners' Capital 47,862,260 64,144,919 70,564,013 78,452,540
98,628,520

Net Asset Value Per
Unit 1,595.11 1,783.35 1,692.08 1,506.89
1,581.75
















Item 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS

Liquidity - The Partnership deposits its assets with DWR as non-

clearing broker and Carr as clearing broker in separate futures

trading accounts established for the Trading Manager, which

assets are used as margin to engage in trading. The assets are

held in either non-interest-bearing bank accounts or in

securities and instruments permitted by the Commodity Futures

Trading Commission ("CFTC") for investment of customer segregated

or secured funds. The Partnership's assets held by the commodity

brokers may be used as margin solely for the Partnership's

trading. Since the Partnership's sole purpose is to trade in

futures and forwards, it is expected that the Partnership will

continue to own such liquid assets for margin purposes.



The Partnership's investment in futures, and forwards may, from

time to time, be illiquid. Most U.S. futures exchanges limit

fluctuations in prices during a single day by regulations

referred to as "daily price fluctuations limits" or "daily

limits". Trades may not be executed at prices beyond the daily

limit. If the price for a particular futures contract has

increased or decreased by an amount equal to the daily limit,

positions in that futures contract can neither be taken nor

liquidated unless traders are willing to effect trades at or

within the limit. Futures prices have occasionally moved the

daily limit for several consecutive days with little or no

trading. These market conditions







could prevent the Partnership from promptly liquidating its

futures contracts and result in restrictions on redemptions.



There is no limitation on daily price moves in trading forward

contracts on foreign currencies. The markets for some world

currencies have low trading volume and are illiquid, which may

prevent the Partnership from trading in potentially profitable

markets or prevent the Partnership from promptly liquidating

unfavorable positions in such markets and subjecting it to

substantial losses. Either of these market conditions could

result in restrictions on redemptions.



The Partnership has never had illiquidity affect a material

portion of its assets.



Capital Resources. The Partnership does not have, or expect to

have, any capital assets. Redemptions of Units in the future

will affect the amount of funds available for investments in

futures interests in subsequent periods. It is not possible to

estimate the amount and therefore, the impact of future

redemptions of Units.



Results of Operations.

General. The Partnership's results depend on its Trading Manager

and the ability of the Trading Manager's trading programs to take

advantage of price



movements or other profit opportunities in the futures, forwards,

and options markets. The following presents a summary of the

Partnership's operations for the three years ended December 31,

1999 and a general discussion of its trading activities during

each period. It is important to note, however, that the Trading

Manager trades in various markets at different times and that

prior activity in a particular market does not mean that such

market will be actively traded by the Trading Manager or will be

profitable in the future. Consequently, the results of

operations of the Partnership are difficult to discuss other than

in the context of its Trading Manager's trading activities on

behalf of the Partnership as a whole and how the Partnership has

performed in the past.




At December 31, 1999, the Partnership's total capital was

$48,527,568, a decrease of $16,361,170 from the Partnership's

total capital of $64,888,738 at December 31, 1998. For the year

ended December 31, 1999, the Partnership generated a net loss of

$6,483,053, and total redemptions aggregated $9,878,117.



For the year ended December 31, 1999, the Partnership recorded

total trading losses, net of interest income, of $1,033,483 and

posted a decrease in Net Asset Value per Unit. The Partnership

experienced losses in the global





interest rate futures markets, approximately 9.82%, primarily

from short Australian interest rate futures positions as prices

increased during July and August on the temporary strength in

U.S. bonds and weaker-than-expected business spending data out of

Australia. Additional losses were recorded from short Japanese

bond futures positions as prices increased during the first and

third quarters. In the currency markets, losses of approximately

7.03% were recorded primarily from Australian dollar positions.

Throughout a majority of the first quarter, losses were

experienced from long Australian dollar positions as its value

dropped significantly relative to the U.S. dollar on speculation

regarding potential currency devaluations in the Asian region.

Early in the third quarter, additional losses were recorded from

long positions in this currency due to depressed commodities

prices, emerging market concerns and on-going talks that China

may eventually devalue its currency. Newly established short

positions in the Australian dollar resulted in losses during

September as its value strengthened relative to the U.S. dollar

following the rally in gold prices. Offsetting currency gains of

3.82% were recorded from Japanese yen positions, primarily long

positions. During the third quarter, gains were recorded from

long positions in the Japanese yen as the value of the yen

climbed to a 44-month high versus the U.S. dollar due to

continued optimism over Japan's economic recovery. The energy

markets produced gains of approximately 7.31%. During March,

gains were recorded from long positions in oil futures as prices

moved significantly higher on news





that both OPEC and non-OPEC countries had reached an agreement to

cut total output beginning April 1st. Gains were also recorded

in this market complex during the third quarter after OPEC

ministers confirmed that they would uphold their global cutbacks

until April of next year. Total expenses for the year were

$5,449,570, resulting in a net loss of $6,483,053. The value of

a Unit decreased from $1,783.35 at December 31, 1998 to $1,595.11

at December 31, 1999.



At December 31, 1998, the Partnership's total capital was

$64,888,738, a decrease of $7,370,890 from the Partnership's

total capital of $72,259,628 at December 31, 1997. For the year

ended December 31, 1998, the Partnership generated net income of

$3,166,040, and total redemptions aggregated $10,536,930.



For the year ended December 31, 1998, the Partnership recorded

total trading revenues, including interest income, of $9,448,680

and posted an increase in Net Asset Value per Unit. Gains of

approximately 13.78% were recorded in the global interest rate

futures markets from bond futures in most major world countries

throughout the year. The most significant gains were recorded in

German bond futures, by approximately 5.56%, U.S. bond futures,

by approximately 3.98% and Japanese bond futures, by

approximately 3.30% from primarily long positions during August

and September as investors sought the





safety of fixed income investments from notable volatility in the

global financial markets. Additional profits were recorded from

short Japanese government bond futures positions during December

as prices declined amid a surge in Japanese bond yields, which

was attributed to news that Japan's Ministry of Finance will end

outright purchases of government debt. Total expenses for the

year were $6,282,640, resulting in net income of $3,166,040. The

value of a Unit increased from $1,692.08 at December 31, 1997 to

$1,783.35 at December 31, 1998.



At December 31, 1997, the Partnership's total capital was

$72,259,628, a decrease of $7,702,955 from the Partnership's

total capital of $79,962,583 at December 31, 1996. For the year

ended December 31, 1997, the Partnership generated net income of

$8,729,367 and total redemptions aggregated $16,432,322.



For the year ended December 31, 1997, the Partnership recorded

total trading revenues, including interest income, of $16,870,923

and posted an increase in Net Asset value per Unit. 1997 was a

profitable year for the Partnership. Gains of approximately

19.80% were recorded in the currency markets primarily from

sustained price movements during January and February and then

again in November and December from short Japanese yen positions

as the value of the U.S. dollar increased versus the yen. A

portion of the Partnership's overall gains was offset by losses

of approximately 4.95% recorded in the global



interest rate futures markets primarily due to a sharp trend

reversal in international interest rate futures prices during the

fourth quarter and as a result of short-term volatility in

domestic bond and stock index futures. Offsetting gains were

recorded from long global interest rate futures positions during

June and July. Although, many of the profitable periods with

long price trends were followed by trend reversals and short-term

volatile price movement, DWFCM's intermediate to long-term trend

following trading methodology was able to retain profits. Total

expenses for the year were $8,141,556, resulting in net income of

$8,729,367. The value of a Unit increased from $1,506.89 at

December 31, 1996 to $1,692.08 at December 31, 1997.



The Partnership's overall performance record represents varied

results of trading in different futures interests markets. For a

further description of 1999 trading results, refer to the letter

to the Limited Partners in the accompanying Annual Report to

Limited Partners for the year ended December 31, 1999, which is

incorporated by reference to Exhibit 13.01 of this Form 10-K.

The Partnership's gains and losses are allocated among its

partners for income tax purposes.



Credit Risk.

Financial Instruments. The Partnership is a party to financial

instruments with elements of off-balance sheet market and credit

risk. The Partnership



may trade futures, forwards, and options in a portfolio of

agricultural commodities, energy products, foreign currencies,

interest rates, precious and base metals, soft commodities, and

stock indices. In entering into these contracts, the Partnership

is subject to the market risk that such contracts may be

significantly influenced by market conditions, such as interest

rate volatility, resulting in such contracts being less valuable.

If the markets should move against all of the positions held by

the Partnership at the same time, and if the Trading Manager was

unable to offset positions of the Partnership, the Partnership

could lose all of its assets and investors would realize a 100%

loss.



In addition to the Trading Manager's internal controls, the

Trading Manager must comply with the trading policies of the

Partnership. These trading policies include standards for

liquidity and leverage with which the Partnership must comply.

The Trading Manager and Demeter monitor the Partnership's trading

activities to ensure compliance with the trading policies.

Demeter may require the Trading Manager to modify positions of

the Partnership if Demeter believes they violate the

Partnership's trading policies.



In addition to market risk, in entering into futures, forwards,

and options contracts there is a credit risk to the Partnership

that the counterparty on a contract will not be able to meet its

obligations to the Partnership. The


ultimate counterparty or guarantor of the Partnership for futures

contracts traded in the United States and the foreign exchanges

on which the Partnership trades is the clearinghouse associated

with such exchange. In general, a clearinghouse is backed by the

membership of the exchange and will act in the event of non-

performance by one of its members or one of its member's

customers, which should significantly reduce this credit risk.

For example, a clearinghouse may cover a default by drawing upon

a defaulting member's mandatory contributions and/or non-

defaulting members' contributions to a clearinghouse guarantee

fund, established lines or letters of credit with banks, and/or

the clearinghouse's surplus capital and other available assets of

the exchange and clearinghouse, or assessing its members. In

cases where the Partnership trades off-exchange forward contracts

with a counterparty, the sole recourse of the Partnership will be

the forward contracts counterparty.



There is no assurance that a clearinghouse or exchange will meet

its obligations to the Partnership, and Demeter and the commodity

brokers will not indemnify the Partnership against a default by

such parties. Further, the law is unclear as to whether a

commodity broker has any obligation to protect its customers from

loss in the event of an exchange or clearinghouse defaulting on

trades effected for the broker's customers. Any such obligation

on the part of a broker appears even less clear where the default

occurs in a non-U.S. jurisdiction.





Demeter deals with these credit risks of the Partnership in

several ways. First, it monitors the Partnership's credit

exposure to each exchange on a daily basis, calculating not only

the amount of margin required for it but also the amount of its

unrealized gains at each exchange, if any. The commodity brokers

inform the Partnership, as with all their customers, of its net

margin requirements for all its existing open positions, but do

not break that net figure down, exchange by exchange. Demeter,

however, has installed a system which permits it to monitor the

Partnership's potential margin liability, exchange by exchange.

As a result, Demeter is able to monitor the Partnership's

potential net credit exposure to each exchange by adding the

unrealized trading gains on that exchange, if any, to the

Partnership's margin liability thereon.



Second, the Partnership's trading policies limit the amount of

its Net Assets that can be committed at any given time to futures

contracts and require, in addition, a minimum amount of

diversification in the Partnership's trading, usually over

several different products. One of the aims of such trading

policies has been to reduce the credit exposure of the

Partnership to a single exchange and, historically, the

Partnership's exposure to any one exchange has typically amounted

to only a small percentage of its total Net Assets. On those

relatively few occasions where the Partnership's credit exposure

may climb above that level, Demeter deals with the situation on a

case by case basis, carefully weighing whether the increased

level of credit exposure



remains appropriate. Material changes to the trading policies

may be made only with the prior written approval of the limited

partners owning more than 50% of Units then outstanding.



Third, Demeter has secured, with respect to Carr acting as the

clearing broker for the Partnership, a guarantee by Credit

Agricole Indosuez, Carr's parent, of the payment of the "net

liquidating value" of the transactions (futures and forward

contracts) in the Partnership's account.



With respect to forward contract trading, the Partnership trades

with only those counterparties which Demeter, together with DWR,

have determined to be creditworthy. At the date of this filing,

the Partnership deals only with Carr as its counterparty on

forward contracts. The guarantee by Carr's parent, discussed

above, covers these forward contracts.



See "Financial Instruments" under Notes to Financial Statements

in the Partnership's Annual Report to Limited Partners for the

year ended December 31, 1999, which is incorporated by reference

to Exhibit 13.01 of this Form

10-K.



Year 2000. Commodity pools, like financial and business

organizations and individuals around the world, depend on the

smooth functioning of computer systems. The Year 2000 issue

arose since many of the world's computer systems



(including those in non-information technology systems)

traditionally recorded years in a two-digit format. If not

addressed, such computer systems may have been unable to properly

interpret dates beyond the year 1999, which may have led to

business disruptions in the U.S. and internationally. Such

disruptions could have adversely affected the handling or

determination of futures trades and prices and other services for

the Partnership. Accordingly, Demeter has fully participated in

a firmwide initiative established by MSDW to address issues

associated with the Year 2000. As part of this initiative, MSDW

reviewed its global software and hardware infrastructure for

mainframe, server and desktop computing environments and engaged

in extensive remediation and testing. The Year 2000 initiative

also encompassed the review of agencies, vendors and facilities

for Year 2000 compliance.



Since 1995, MSDW prepared actively for the Year 2000 issue to

ensure that it would have the ability to respond to any critical

business process failure, to prevent the loss of workspace and

technology, and to mitigate any potential financial loss or

damage to its global franchise. Where necessary, contingency

plans were expanded or developed to address specific Year 2000

risk scenarios, supplementing existing business policies and

practices. In conjunction with MSDW's Year 2000 preparations,

Demeter monitored the progress of Carr and the Trading Manager

throughout 1999 in their Year 2000 compliance and, where

applicable, tested its external interfaces, with Carr and the





Trading Manager. In addition, Demeter, the commodity brokers,

the Trading Manager and all U.S. futures exchanges were subjected

to monitoring by the CFTC of their Year 2000 preparedness, and

the major foreign futures exchanges engaged in market-wide

testing of their Year 2000 compliance during 1999.



MSDW and Demeter consider the transition into the Year 2000

successful from the perspective of their internal systems and

global external interactions. Over the millennial changeover

period, no material issues were encountered, and MSDW, Demeter

and the Partnership conducted business as usual.



Risks Associated With the Euro. On January 1, 1999, eleven

countries in the European Union established fixed conversion

rates on their existing sovereign currencies and converted to a

common single currency (the euro). During a three-year

transition period, the sovereign currencies will continue to

exist but only as a fixed denomination of the euro. Conversion

to the euro prevents the Trading Manager from trading those

sovereign currencies and thereby limits its ability to take

advantage of potential market opportunities that might otherwise

have existed had separate currencies been available to trade.

This could adversely affect the performance results of the

Partnership.

Item 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET
RISK

Introduction

The Partnership is a commodity pool involved in the speculative

trading of futures interests. The market-sensitive instruments

held by the Partnership



are acquired for speculative trading purposes only and, as a

result, all or substantially all of the Partnership's assets are

at risk of trading loss. Unlike an operating company, the risk

of market-sensitive instruments is central, not incidental, to

the Partnership's main business activities.



The futures interests traded by the Partnership involve varying

degrees of market risk. Market risk is often dependent upon

changes in the level or volatility of interest rates, exchange

rates, and prices of financial instruments and commodities.

Fluctuations in market risk based upon these factors result in

frequent changes in the fair value of the Partnership's open

positions, and, consequently, in its earnings and cash flow.



The Partnership's total market risk is influenced by a wide

variety of factors, including the diversification among the

Partnership's open positions, the volatility present within the

markets, and the liquidity of the markets. At different times,

each of these factors may act to increase or decrease the market

risk associated with the Partnership.



The Partnership's past performance is not necessarily indicative

of its future results. Any attempt to numerically quantify the

Partnership's market risk is limited by the uncertainty of its

speculative trading. The Partnership's speculative trading may

cause future losses and volatility (i.e. "risk of





ruin") that far exceed the Partnership's experiences to date or

any reasonable expectations based upon historical changes in

market value.



Quantifying the Partnership's Trading Value at Risk

The following quantitative disclosures regarding the

Partnership's market risk exposures contain "forward-looking

statements" within the meaning of the safe harbor from civil

liability provided for such statements by the Private Securities

Litigation Reform Act of 1995 (set forth in Section 27A of the

Securities Act of 1933 and Section 21E of the Securities Exchange

Act of 1934). All quantitative disclosures in this section are

deemed to be forward-looking statements for purposes of the safe

harbor, except for statements of historical fact.



The Partnership accounts for open positions using mark-to-market

accounting principles. Any loss in the market value of the

Partnership's open positions is directly reflected in the

Partnership's earnings, whether realized or unrealized, and its

cash flow. Profits and losses on open positions of exchange

traded-futures interests are settled daily through variation

margin.



The Partnership's risk exposure in the market sectors traded by

the Trading Manager is estimated below in terms of Value at Risk

("VaR"). The VaR model used by the Partnership includes many

variables that could change the market value of the Partnership's

trading portfolio. The Partnership estimates VaR



using a model based upon historical simulation with a confidence

level of 99%. Historical simulation involves constructing a

distribution of hypothetical daily changes in the value of a

trading portfolio. The VaR model takes into account linear

exposures to price and interest rate risk. Market risks that are

incorporated in the VaR model include equity and commodity

prices, interest rates, foreign exchange rates, and correlation

among these variables. The hypothetical changes in portfolio

value are based on daily percentage changes observed in key

market indices or other market factors ("market risk factors") to

which the portfolio is sensitive. The historical observation

period of the Partnership's VaR is approximately four years. The

one-day 99% confidence level of the Partnership's VaR corresponds

to the negative change in portfolio value that, based on observed

market risk factors, would have been exceeded once in 100 trading

days.



VaR models, including the Partnership's, are continuously

evolving as trading portfolios become more diverse and modeling

techniques and systems capabilities improve. Please note that

the VaR model is used to numerically quantify market risk for

historic reporting purposes only and is not utilized

by either Demeter or the Trading Manager in their daily risk

management activities.







The Partnership's Value at Risk in Different Market Sectors

The following tables indicates the VaR associated with the

Partnership's open positions as a percentage of total Net Assets

by primary market risk category as of December 31, 1999 and 1998.

As of December 31, 1999 and 1998, the Partnership's total

capitalization was approximately $49 million and $65 million,

respectively.

Primary Market December 31, 1999
December 31, 1998
Risk Category Value at Risk Value at
Risk

Interest Rate (.19)% (.54)%

Currency (.80) (.95)

Commodity (.82)

(1.04)

Equity (.15)

(.22)

Aggregate Value at Risk (1.26)%

(1.37)%



Aggregate Value at Risk represents the aggregate VaR of all the

Partnership's open positions and not the sum of the VaR of the

individual Market Categories listed above. Aggregate VaR will be

lower as it takes into account correlation among different

positions and categories.


The table above represents the VaR of the Partnership's open

positions at December 31, 1999 and 1998 only and is not

necessarily representative of either the historic or future risk

of an investment in the Partnership. Because the Partnership's

only business is the speculative trading of futures interests,

the composition of its trading portfolio can change significantly



over any given time period, or even within a single trading day.

Any changes in open positions could positively or negatively

materially impact market risk as measured by VaR.



The table below supplements the year end VaR by presenting the

Partnership's high, low and average VaR, as a percentage of total

net assets for the four quarterly reporting periods from January

1, 1999 through December 31, 1999.

Primary Market Risk Category High Low

Average

Interest Rate (1.92)% (.19)% (.98)%

Currency (1.97) (.80)

(1.61)

Commodity (1.38) (.82)

(1.04)

Equity (.74) (.15) (.38)

Aggregate Value at Risk (3.16)% (1.26)%
(2.28)%


Limitations on Value at Risk as an Assessment of Market Risk

The face value of the market sector instruments held by the

Partnership is typically many times the applicable margin

requirements. Margin requirements generally range between 2% and

15% of contract face value. Additionally, the use of leverage

causes the face value of the market sector instruments held by

the Partnership to typically be many times the total

capitalization of the Partnership. The value of the

Partnership's open positions thus creates a "risk of ruin" not

typically found in other investments. The relative size of the

positions held may cause the Partnership to incur losses greatly

in excess



of VaR within a short period of time, given the effects of the

leverage employed and market volatility. The VaR tables above,

as well as the past performance of the Partnership, gives no

indication of such "risk of ruin". In addition, VaR risk measures

should be viewed in light of the methodology's limitations, which

include the following:

past changes in market risk factors will not always result

in accurate predictions of the distributions and correlations of

future market movements;

changes in portfolio value in response to market movements

may differ from those of the VaR model;

VaR results reflect past trading positions while future risk

depends on future positions;

VaR using a one-day time horizon does not fully capture the

market risk of positions that cannot be liquidated or hedged

within one day; and

the historical market risk factor data used for VaR

estimation may provide only limited insight into losses that

could be incurred under certain unusual market movements.

The VaR tables above present the results of the Partnership's VaR

for each of the Partnership's market risk exposures and on an

aggregate basis at December 31, 1999 and for the end of the four

quarterly reporting periods during calendar year 1999. Since VaR

is based on historical data, VaR should not be viewed as

predictive of the Partnership's future financial performance or

its ability to manage or monitor risk. There can be no assurance

that the



Partnership's actual losses on a particular day will not exceed

the VaR amounts indicated above or that such losses will not

occur more than 1 in 100 trading days.



Non-Trading Risk

The Partnership has non-trading market risk on its foreign cash

balances not needed for margin. These balances and any market

risk they may represent are immaterial. The Partnership also

maintains a substantial portion (approximately 90%) of its

available assets in cash at DWR. A decline in short-term

interest rates will result in a decline in the Partnership's cash

management income. This cash flow risk is not considered

material.



Materiality, as used throughout this section, is based on an

assessment of reasonably possible market movements and any

associated potential losses, taking into account the leverage,

optionality and multiplier features of the Partnership's market-

sensitive instruments.



Qualitative Disclosures Regarding Primary Trading Risk Exposures

The following qualitative disclosures regarding the Partnership's

market risk exposures - except for (A) those disclosures that are

statements of historical fact and (B) the descriptions of how the

Partnership manages its primary market risk exposures -

constitute forward-looking statements within the meaning of

Section 27A of the Securities Act and Section 21E of the

Securities



Exchange Act. The Partnership's primary market risk exposures as

well as the strategies used and to be used by Demeter and the

Trading Manager for managing such exposures are subject to

numerous uncertainties, contingencies and risks, any one of which

could cause the actual results of the Partnership's risk controls

to differ materially from the objectives of such strategies.

Government interventions, defaults and expropriations, illiquid

markets, the emergence of dominant fundamental factors, political

upheavals, changes in historical price relationships, an influx

of new market participants, increased regulation and many other

factors could result in material losses as well as in material

changes to the risk exposures and the risk management strategies

of the Partnership. Investors must be prepared to lose all or

substantially all of their investment in the Partnership.



The following were the primary trading risk exposures of the

Partnership as of December 31, 1999, by market sector. It may be

anticipated however, that these market exposures will vary

materially over time.



Interest Rates. The largest exposure this quarter was in the

interest rate sector. Exposure was spread across the U.S., Swiss,

Australian, and Japanese interest rate sectors. Interest rate

movements directly affect the price of the sovereign bond

positions held by the Partnership and indirectly affect the value

of its stock index and currency positions. Interest rate

movements in one country as well as relative interest rate

movements between countries



materially impact the Partnership's profitability. The

Partnership's primary interest rate exposure is generally to

interest rate fluctuations in the G-7 countries and Australia.

The G-7 countries consist of France, U.S., Britain, Germany,

Japan, Italy and Canada. Demeter anticipates that G-7 and

Australian interest rates will remain the primary interest rate

exposure of the Partnership for the foreseeable future. The

changes in interest rates, which have the most effect on the

Partnership, are changes in long-term and medium-term

instruments. Consequently, even a material change in short-term

rates would have little effect on the Partnership, were the

medium to long term rates to remain steady.



Currency. The next most significant exposure in the Partnership

is in the currency complex. The Partnership's currency exposure

is to exchange rate fluctuations, primarily fluctuations that

disrupt the historical pricing relationships between different

currencies and currency pairs. Interest rate changes as well as

political and general economic conditions influence these

fluctuations. The Partnership trades in a large number of

currencies, including cross-rates i.e., positions between two

currencies other than the U.S. Dollar. For the fourth quarter of

1999, the Partnership's foreign currency exposure was in the euro

currency crosses and outright U.S. dollar positions (outright

positions consist of the U.S. dollar vs. other currencies). The

currency trading VaR figure includes foreign margin amounts





converted into U.S. dollars with an incremental adjustment to

reflect the exchange rate risk inherent to the dollar-based

Partnership in expressing VaR in a functional currency other than

dollars.



Commodity.

Metals. The next noteworthy exposure was in the base and

precious metals markets. The Partnership's metals market exposure

in the fourth quarter of 1999 was to fluctuations in the prices

of base metals, as well as exposure in the gold and silver

markets. A significant amount of exposure was evident in the

base metals as the Partnership held sizeable positions due to a

period of low volatility prior to the upward price breakout.



The Partnership aims to equally weight market exposure in the

metals as much as possible, however base metals, during periods

of volatility, will affect performance more dramatically than the

precious metals markets. Demeter anticipates that base metals

will remain the primary metals market exposure of the

Partnership.



Energy. On December 31, 1999, the Partnership's energy exposure

was in futures contracts in the New York and Brent crude oil

markets. Price movements in these markets result from political

developments in the Middle East, weather patterns, and other

economic fundamentals. As oil prices have increased over 100%

this year, and, given that the agreement by OPEC to cut



production is closing in on expiring in March of 2000, it is

possible that volatility will remain on the high end. Significant

profits and losses have been and are expected to continue to be

experienced in these markets.



Soft Commodities. On December 31, 1999, the Partnership had

moderate exposure in the markets that comprise these sectors.

Most of the exposure however was in the cotton and sugar markets.

Supply and demand inequalities, severe weather disruptions and

market expectations affect price movements in these markets.



Equity. The Partnership's equity exposure on December 31, 1999

to price risk in the S&P 500 futures index was noteworthy. The

stock index futures traded by the Partnership are by law limited

to futures on broadly based indices. Demeter anticipates little,

if any, trading in non G-7 stock indices. The Partnership is

primarily exposed to the risk of adverse price trends or static

markets in the U.S. and Japanese indices. (Static markets would

not cause major market changes but would make it difficult for

the Partnership to avoid being "whipsawed" into numerous small

losses.)



Qualitative Disclosures Regarding Non-Trading Risk Exposure

The following was the only non-trading risk exposure of the

Partnership as of December 31, 1999.





Foreign Currency Balances. The Partnership's foreign currency

balances are in Japanese yen, British pounds, euros, Swiss francs

and Australian dollars. The Partnership controls the non-trading

risk of these balances by regularly converting these balances

back into dollars upon liquidation of the respective position.



Qualitative Disclosures Regarding Means of Managing Risk Exposure

The Partnership and the Trading Manager, attempts to manage the

risk of the Partnership's open positions in essentially the same

manner in all market categories traded. Demeter attempts to

manage market exposure by diversifying the Partnership's assets

among different market sectors and trading approaches, and

monitoring the performance of the Trading Manager daily. In

addition, the Trading Manager establishes diversification

guidelines, often set in terms of the maximum margin to be

committed to positions in any one market sector or market

sensitive instrument.



Demeter monitors and controls the risk of the Partnership's non-

trading instrument, cash. Cash is the only Partnership

investment directed by Demeter, rather than the Trading Manager.



Item 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The Financial Statements are incorporated by reference to the

Partnership's Annual Report, which is filed as Exhibit 13.01

hereto.



Supplementary data specified by Item 302 of Regulation S-K

(selected quarterly financial data) is not applicable.



Item 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON
ACCOUNTING AND FINANCIAL DISCLOSURE

None.


























PART III


Item 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT



Directors and Officers of the General Partner

The directors and officers of Demeter as of the close of business

on December 31, 1999 were as follows:



Robert E. Murray, age 39, is Chairman of the Board, President and

a Director of Demeter. Mr. Murray is also Chairman of the Board,

President and a Director of DWFCM. Effective as of the close of

business on January 31, 2000, Mr. Murray replaced Mr. Hawley as

Chairman of the Board of Demeter and DWFCM. Mr. Murray is

currently a Senior Vice President of DWR's Managed Futures

Department. Mr. Murray began his career at DWR in 1984 and is

currently the Director of the Managed Futures Department. In this

capacity, Mr. Murray is responsible for overseeing all aspects of

the firm's Managed Futures Department. Mr. Murray currently

serves as Vice Chairman and a Director of the Managed Funds

Association, an industry association for investment professionals

in futures, hedge funds and other alternative investments. Mr.

Murray graduated from Geneseo State University in May 1983 with a

B.A. degree in Finance.







Mitchell M. Merin, age 46, is a Director of Demeter. Mr. Merin

is also a Director of DWFCM. Mr. Merin was appointed the Chief

Operating Officer of Individual Asset Management for MSDW in

December 1998 and the President and Chief Executive Officer of

Morgan Stanley Dean Witter Advisors in February 1998. He has

been an Executive Vice President of DWR since 1990, during which

time he has been director of DWR's Taxable Fixed Income and

Futures divisions, Managing Director in Corporate Finance and

Corporate Treasurer. Mr. Merin received his Bachelor's degree

from Trinity College in Connecticut and his M.B.A. degree in

finance and accounting from the Kellogg Graduate School of

Management of Northeastern University in 1977.



Joseph G. Siniscalchi, age 54, is a Director of Demeter. Mr.

Siniscalchi joined DWR in July 1984 as a First Vice President,

Director of General Accounting and served as a Senior Vice

President and Controller for DWR's Securities Division through

1997. He is currently Executive Vice President and Director of

the Financial Markets Division of DWR. From February 1980 to July

1984, Mr. Siniscalchi was Director of Internal Audit at Lehman

Brothers Kuhn Loeb, Inc.



Edward C. Oelsner, III, age 57, is a Director of Demeter. Mr.

Oelsner is currently an Executive Vice President and head of the

Product Development Group at Morgan Stanley Dean Witter Advisors,

an affiliate of DWR. Mr. Oelsner





joined DWR in 1981 as a Managing Director in DWR's Investment

Banking Department specializing in coverage of regulated

industries and, subsequently, served as head of the DWR Retail

Products Group. Prior to joining DWR, Mr. Oelsner held positions

at The First Boston Corporation as a member of the Research and

Investment Banking Departments from 1967 to 1981. Mr. Oelsner

received his M.B.A. in Finance from the Columbia University

Graduate School of Business in 1966 and an A.B. in Politics from

Princeton University in 1964.



Lewis A. Raibley, III, age 37, is Vice President and Chief

Financial Officer, and a Director of Demeter. Mr. Raibley is

also a Director of DWFCM. Mr. Raibley is currently Senior Vice

President and Controller in the Individual Asset Management Group

of MSDW. From July 1997 to May 1998, Mr. Raibley served as

Senior Vice President and Director in the Internal Reporting

Department of MSDW and prior to that, from 1992 to 1997, he

served as Senior Vice President and Director in the Financial

Reporting and Policy Division of Dean Witter Discover & Co. He

has been with MSDW and its affiliates since June 1986.



Richard A. Beech, age 48, is a Director of Demeter. Mr. Beech

has been associated with the futures industry for over 23 years.

He has been at DWR since August 1984 where he is presently Senior

Vice President and head of Branch Futures. Mr. Beech began his

career at the Chicago Mercantile





Exchange, where he became the Chief Agricultural Economist doing

market analysis, marketing and compliance. Prior to joining DWR,

Mr. Beech also had worked at two investment banking firms in

operations, research, managed futures and sales management.



Ray Harris, age 43, is a Director of Demeter. Mr. Harris is

currently Executive Vice President, Planning and Administration

for Morgan Stanley Dean Witter Asset Management and has worked at

DWR or its affiliates since July 1982, serving in both financial

and administrative capacities. From August 1994 to January 1999,

he worked in two separate DWR affiliates, Discover Financial

Services and Novus Financial Corp., culminating as Senior Vice

President. Mr. Harris received his B.A. degree from Boston

College and his M.B.A. in finance from the University of Chicago.



Mark J. Hawley, age 56, served as Chairman of the Board and a

Director of Demeter and DWFCM throughout 1999. Mr. Hawley joined

DWR in February 1989 as Senior Vice President and served as

Executive Vice President and Director of DWR's Product Management

for Individual Asset Management throughout 1999. In this

capacity, Mr. Hawley was responsible for directing the activities

of the firm's Managed Futures, Insurance, and Unit Investment

Trust Business. From 1978 to 1989, Mr. Hawley was a member of

the senior management team at Heinold Asset Management, Inc., a

commodity pool operator, and was responsible for a





variety of projects in public futures funds. From 1972 to 1978,

Mr. Hawley was a Vice President in charge of institutional block

trading for the Mid-West at Kuhn Loeb & Company. Mr. Hawley

resigned effective January 31, 2000.



All of the foregoing directors have indefinite terms.



Item 11. EXECUTIVE COMPENSATION

The Partnership has no directors and executive officers. As a

limited partnership, the business of the Partnership is managed

by Demeter, which is responsible for the administration of the

business affairs of the Partnership but receives no compensation

for such services.



Item 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND

MANAGEMENT

(a) Security Ownership of Certain Beneficial Owners - As of

December 31, 1999 there were no persons known to be beneficial

owners of more than 5 percent of the Units.



(b) Security Ownership of Management - At December 31, 1999,

Demeter owned 417.091 Units of General Partnership Interest

representing a 1.37 percent interest in the Partnership.



(c) Changes in Control - None





Item 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

Refer to Note 2 - "Related Party Transactions" of "Notes to

Financial Statements", in the accompanying Annual Report to

Limited Partners, for the year ended December 31, 1999, which is

incorporated by reference to Exhibit 13.01 of this Form 10-K. In

its capacity as the Partnership's retail commodity broker, DWR

received commodity brokerage commissions (paid and accrued by the

Partnership) of $3,442,621 for the year ended December 31, 1999.

In its capacity as the Partnership's Trading Manager, DWFCM

received management fees of $1,687,248 for the year ended

December 31, 1999.

































PART IV

Item 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND
REPORTS ON FORM 8-K


(a) 1. Listing of Financial Statements

The following financial statements and report of independent

public accountants, all appearing in the accompanying Annual

Report to Limited Partners, for the year ended December 31,

1999 are incorporated by reference to Exhibit 13.01 of this

Form 10-K:

- - Report of Deloitte & Touche LLP, independent
auditors, for the
years ended December 31, 1999, 1998 and 1997.

- - Statements of Financial Condition as of December 31, 1999
and 1998.

- - Statements of Operations, Changes in Partners' Capital, and
Cash Flows for the years ended December 31, 1999, 1998 and 1997.

- - Notes to Financial Statements.

With the exception of the aforementioned information and the

information incorporated in Items 7, 8 and 13, the Annual

Report to Limited Partners for the year ended December 31,

1999 is not deemed to be filed with this report.



2. Listing of Financial Statement Schedules

No financial statement schedules are required to be filed

with this report.



(b) Reports on Form 8-K

No reports on Form 8-K have been filed by the Partnership

during the last quarter of the period covered by this

report.



(c) Exhibits

Refer to Exhibit Index on Page E-1.





SIGNATURES

Pursuant to the requirements of Sections 13 or 15(d) of the
Securities Exchange Act of 1934, the registrant has duly caused
this report to be signed on its behalf by the undersigned,
thereunto duly authorized.

DEAN WITTER
DIVERSIFIED FUTURES FUND III L.P.

(Registrant)

BY: Demeter
Management Corporation,
General
Partner

March 30, 2000 BY: /s/ Robert E. Murray
Robert E. Murray, Director,
Chairman of the Board and
President

Pursuant to the requirements of the Securities Exchange Act of
1934, this report has been signed below by the following persons
on behalf of the registrant and in the capacities and on the
dates indicated.

Demeter Management Corporation.


/s/ Robert E. Murray __ March
30, 2000
Robert E. Murray, Director,
Chairman of the Board and
President

/s/ Joseph G. Siniscalchi __ March
30, 2000
Joseph G. Siniscalchi, Director

/s/ Edward C. Oelsner III __ March
30, 2000
Edward C. Oelsner III, Director

/s/ Mitchell M. Merin March 30, 2000
Mitchell M. Merin, Director

/s/ Richard A. Beech March 30, 2000
Richard A. Beech, Director

/s/ Ray Harris March 30,
2000
Ray Harris, Director

/s/ Lewis A. Raibley, III __ March 30,
2000
Lewis A. Raibley, III, Director, Chief
Financial Officer and Principal
Accounting Officer




EXHIBIT INDEX
ITEM
METHOD OF FILING

3.01 Limited Partnership Agreement of
the Partnership, dated as of
July 12, 1990. (1)

3.02 Form of Amendment No. 1 to the
Limited Partnership Agreement
of the Partnership. (2)

10.01 Management
Agreement among the
Partnership, Demeter Management
Corporation and Dean Witter Futures (3)
& Currency Management Inc. dated
as of July 12, 1990.

10.02 Form of
Amendment No. 1 to the
Management Agreement. (4)

13.01 Annual
Report to Limited Partners for the year ended
December 31, 1999. (5)

(1)
Incorporated by reference to Exhibit 3.01 and Exhibit 3.02
of the Partnership's Registration Statement on Form S-1,
File No. 33-34989, filed on May 21, 1990.

(2) Incorporated by reference to Exhibit 3.01(a) of the
Partnership's Registration Statement on Form S-1, File No.
33-47797, filed on May 11, 1992.

(3)
Incorporated by reference to Exhibit 10.02 of the
Partnership's Registration Statement on Form S-1, File No.
33-34989, filed on May 21, 1990.

(4)
Incorporated by reference to Exhibit 10.02(a) of the
Partnership's Registration Statement on Form S-1, File No.
33-47797, filed on May 11, 1992.

(6) Filed
herewith.







Diversified
Futures
Fund III

December 31, 1999
Annual Report

MORGAN STANLEY DEAN WITTER


Demeter Management Corporation
Two World Trade Center
62nd Floor
New York, NY 10048
Telephone (212) 392-8899

Dean Witter Diversified Futures Fund III L.P.
Annual Report
1999

Dear Limited Partner:

This marks the tenth annual report for the Dean Witter Diversified Futures Fund
III L.P. (the "Fund"). The Fund began the year at a Net Asset Value of
$1,783.35 and decreased by 10.6% to $1,595.11 on December 31, 1999. The Fund
has increased by 59.6% since it began trading in November 1990 (a compound
annualized return of 5.2%).

Overall, the Fund experienced difficulty in the global interest rate futures
markets primarily from short Australian interest rate futures positions as
prices increased during July and August on the temporary strength in U.S. bonds
and weaker-than-expected business spending data out of Australia. Additional
losses were recorded from short Japanese bond futures positions as prices in-
creased during the first quarter and the third quarter. In the currency mar-
kets, losses were recorded throughout the majority of the first quarter from
long Australian dollar positions as its value dropped significantly relative to
the U.S. dollar on speculation regarding potential currency devaluations in the
Asian region. Early in the third quarter, losses were recorded from long posi-
tions in this currency due to depressed commodities prices, emerging market
concerns and on-going talks that China may eventually devalue its currency.
Newly established short positions in the Australian dollar resulted in addi-
tional losses during September as its value strengthened relative to the U.S.
dollar following the rally in gold prices. Offsetting currency gains were re-
corded during the third quarter from long positions in the Japanese yen as the
value of the yen climbed to a 44-month high versus the U.S. dollar due to con-
tinued optimism over Japan's economic recovery. The energy markets were profit-
able during March from long positions


in oil futures as prices moved significantly higher on news that both OPEC and
non-OPEC countries had reached an agreement to cut total output beginning April
1st. Gains were also recorded in this market during the third quarter after
OPEC ministers confirmed that they would uphold their global cutbacks until
April of 2000.

While we are disappointed that the Fund had a difficult year in 1999, we remind
investors that managed futures funds such as Diversified Futures Fund III are
designed to provide diversification and non-correlation, that is, the ability
to perform independently, of global equities and bonds. Managed futures have
historically performed independently of traditional investments, such as stocks
and bonds. This is referred to as non-correlation, or the potential for managed
futures to perform when traditional markets such as stocks and bonds may expe-
rience difficulty performing. Of course, managed futures funds will not auto-
matically be profitable during unfavorable periods for these traditional in-
vestments and vice versa. The degree of non-correlation of any given managed
futures fund will vary, particularly as a result of market conditions, and some
funds will have significantly lesser degrees of non-correlation (i.e., greater
correlation) with stocks and bonds than others. Managed futures have histori-
cally performed independently of traditional investments, such as stocks and
bonds. 1999 proved to be another strong year for equities, due in large part to
continued growth and stability in most major world economies accompanied by low
inflation. This environment, while strong for equities, provided few major sus-
tained price trends in the world's futures and currency markets, and as such,
proved to be a difficult trading environment for the money manager in this
Fund, whose trading strategy relies on the existence of longer-term price
trends for trading opportunities. Nevertheless, we remain confident in the role
that managed futures investments play in the overall investment portfolio, and
we believe this confidence is well-founded based on the longer-term diversified
non-correlated returns of this alternative investment. Demeter Management


Corporation, as General Partner to the Fund, has been and continues to be an
active investor with more than $18 million invested among the 24 managed
futures funds to which we act as General Partner.

Should you have any questions concerning this report, please feel free to con-
tact Demeter Management Corporation at Two World Trade Center, 62nd Floor, New
York, NY 10048 or your Morgan Stanley Dean Witter Financial Advisor.

I hereby affirm, that to the best of my knowledge and belief, the information
contained in this report is accurate and complete. Past performance is not a
guarantee of future results.

Sincerely,


/s/ Robert E. Murray

Robert E. Murray
Chairman
Demeter Management Corporation
General Partner


Dean Witter Diversified Futures Fund III L.P.
Independent Auditors' Report

The Limited Partners and the General Partner:

We have audited the accompanying statements of financial condition of Dean Wit-
ter Diversified Futures Fund III L.P. (the "Partnership") as of December 31,
1999 and 1998 and the related statements of operations, changes in partners'
capital, and cash flows for each of the three years in the period ended Decem-
ber 31, 1999. These financial statements are the responsibility of the Partner-
ship's management. Our responsibility is to express an opinion on these finan-
cial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing stan-
dards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of mate-
rial misstatement. An audit includes examining, on a test basis, evidence sup-
porting the amounts and disclosures in the financial statements. An audit also
includes assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall financial statement pre-
sentation. We believe that our audits provide a reasonable basis for our opin-
ion.

In our opinion, such financial statements present fairly, in all material re-
spects, the financial position of Dean Witter Diversified Futures Fund III L.P.
at December 31, 1999 and 1998 and the results of its operations and its cash
flows for each of the three years in the period ended December 31, 1999 in con-
formity with generally accepted accounting principles.

/s/ Deloitte & Touche LLP

February 14, 2000
(March 3, 2000 as to Note 5)
New York, New York


Dean Witter Diversified Futures Fund III L.P.
Statements of Financial Condition



December 31,
---------------------
1999 1998
---------- ----------
$ $

ASSETS
Equity in futures interests trading
accounts:
Cash 47,778,818 63,721,724
Net unrealized gain on open
contracts 1,959,828 1,769,839
---------- ----------
Total Trading Equity 49,738,646 65,491,563
Interest receivable (DWR) 178,458 195,823
---------- ----------
Total Assets 49,917,104 65,687,386
========== ==========

LIABILITIES AND PARTNERS' CAPITAL
LIABILITIES
Redemptions payable 1,195,090 536,350
Accrued management fee (DWFCM) 125,214 164,947
Administrative expenses payable 69,232 97,351
---------- ----------
Total Liabilities 1,389,536 798,648
---------- ----------
PARTNERS' CAPITAL
Limited Partners (30,005.528 and 35,968.774 Units,
respectively) 47,862,260 64,144,919
General Partner (417.091 Units) 665,308 743,819
---------- ----------
Total Partners' Capital 48,527,568 64,888,738
---------- ----------
Total Liabilities and Partners' Capital 49,917,104 65,687,386
========== ==========
NET ASSET VALUE PER UNIT 1,595.11 1,783.35
========== ==========

The accompanying notes are an integral part of these financial statements.


Dean Witter Diversified Futures Fund III L.P.
Statements of Operations



For the Years Ended
December 31,
----------------------------------
1999 1998 1997
---------- ---------- ----------

$ $ $
REVENUES
Trading profit (loss):
Realized (3,300,101) 16,344,815 3,815,795
Net change in unrealized 189,989 (9,385,547) 10,037,069
---------- ---------- ----------
Total Trading Results (3,110,112) 6,959,268 13,852,864
Interest income (DWR) 2,076,629 2,489,412 3,018,059
---------- ---------- ----------
Total Revenues (1,033,483) 9,448,680 16,870,923
---------- ---------- ----------
EXPENSES
Brokerage commissions (DWR) 3,442,621 3,886,833 5,267,971
Management fee (DWFCM) 1,687,248 2,006,537 2,314,199
Transaction fees and costs 246,701 299,270 443,386
Administrative expenses 73,000 90,000 116,000
---------- ---------- ----------
Total Expenses 5,449,570 6,282,640 8,141,556
---------- ---------- ----------
NET INCOME (LOSS) (6,483,053) 3,166,040 8,729,367
========== ========== ==========
Net Income (Loss) Allocation:
Limited Partners (6,404,542) 3,051,370 8,543,795
General Partner (78,511) 114,670 185,572
Net Income (Loss) per Unit:
Limited Partners (188.24) 91.27 185.19
General Partner (188.24) 91.27 185.19


Statements of Changes in Partners' Capital
For the Years Ended December 31, 1999, 1998 and 1997



Units of
Partnership Limited General
Interest Partners Partner Total
----------- ----------- ---------- -----------

$ $ $
Partners' Capital,
December 31, 1996 53,064.589 78,452,540 1,510,043 79,962,583
Net income -- 8,543,795 185,572 8,729,367
Redemptions (10,359.904) (16,432,322) -- (16,432,322)
----------- ----------- ---------- -----------
Partners' Capital,
December 31, 1997 42,704.685 70,564,013 1,695,615 72,259,628
Net income -- 3,051,370 114,670 3,166,040
Redemptions (6,318.820) (9,470,464) (1,066,466) (10,536,930)
----------- ----------- ---------- -----------
Partners' Capital, December
31, 1998 36,385.865 64,144,919 743,819 64,888,738
Net loss -- (6,404,542) (78,511) (6,483,053)
Redemptions (5,963.246) (9,878,117) -- (9,878,117)
----------- ----------- ---------- -----------
Partners' Capital,
December 31, 1999 30,422.619 47,862,260 665,308 48,527,568
=========== =========== ========== ===========

The accompanying notes are an integral part of these financial statements.


Dean Witter Diversified Futures Fund III L.P.
Statements of Cash Flows



For the Years Ended
December 31,
-------------------------------------
1999 1998 1997
----------- ----------- -----------

$ $ $
CASH FLOWS FROM
OPERATING ACTIVITIES
Net income (loss) (6,483,053) 3,166,040 8,729,367
Noncash item included in
net income (loss):
Net change in unrealized (189,989) 9,385,547 (10,037,069)
(Increase) decrease in
operating assets:
Interest receivable (DWR) 17,365 34,568 44,149
Due from DWR -- 3,839 (3,839)
Increase (decrease) in
operating liabilities:
Accrued management fee (DWFCM) (39,733) (20,851) (18,892)
Administrative expenses payable (28,119) 6,086 (6,718)
Accrued brokerage commissions (DWR) -- -- (100,576)
Accrued transaction fees and costs -- -- (15,691)
----------- ----------- -----------
Net cash provided by (used
for) operating activities (6,723,529) 12,575,229 (1,409,269)
----------- ----------- -----------
CASH FLOWS FROM
FINANCING ACTIVITIES
Increase (decrease) in redemptions
payable 658,740 (701,105) 298,626
Redemptions of Units (9,878,117) (10,536,930) (16,432,322)
----------- ----------- -----------
Net cash used for financing activities (9,219,377) (11,238,035) (16,133,696)
----------- ----------- -----------
Net increase (decrease) in cash (15,942,906) 1,337,194 (17,542,965)
Balance at beginning of
period 63,721,724 62,384,530 79,927,495
----------- ----------- -----------
Balance at end of period 47,778,818 63,721,724 62,384,530
=========== =========== ===========

The accompanying notes are an integral part of these financial statements.


Dean Witter Diversified Futures Fund III L.P.
Notes to Financial Statements

1. Summary of Significant Accounting Policies

Organization--Dean Witter Diversified Futures Fund III L.P. (the "Partnership")
is a limited partnership organized to engage primarily in the speculative trad-
ing of commodity futures and forward contracts, physical commodities, and other
commodity interests (collectively, "futures interests").

The general partner for the Partnership is Demeter Management Corporation ("De-
meter"). The non-clearing commodity broker is Dean Witter Reynolds Inc. ("DWR")
and an unaffiliated clearing commodity broker, Carr Futures Inc. ("Carr"), pro-
vides clearing and execution services. The trading manager is Dean Witter
Futures & Currency Management Inc. ("DWFCM" or the "Trading Manager"). Demeter,
DWR and DWFCM are wholly-owned subsidiaries of Morgan Stanley Dean Witter & Co.
("MSDW").

On May 31, 1997, Morgan Stanley Group Inc. was merged with and into Dean Wit-
ter, Discover & Co. ("DWD"). At that time DWD changed its corporate name to
Morgan Stanley, Dean Witter, Discover & Co. (MSDWD"). Effective February 19,
1998, MSDWD changed its corporate name to Morgan Stanley Dean Witter & Co.

Demeter is required to maintain a 1% minimum interest in the equity of the
Partnership and income (losses) are shared by Demeter and the Limited Partners
based upon their proportional ownership interests.

Use of Estimates--The financial statements are prepared in accordance with gen-
erally accepted accounting principles, which require management to make esti-
mates and assumptions that affect the reported amounts in the financial state-
ments and related disclosures. Management believes that the estimates utilized
in the preparation of the financial statements are prudent and reasonable. Ac-
tual results could differ from those estimates.

Revenue Recognition--Futures interests are open commitments until settlement
date. They are valued at market on a daily basis and the resulting net change
in unrealized gains and losses are reflected in the change in unrealized profit
(loss) on open contracts from one period to the next in the statements of oper-
ations. Monthly, DWR pays the Partnership interest income based upon 80% of its
average daily Net Assets for the month at a rate equal to the average yield on
13-week U.S. Treasury bills. For purposes of such interest payments, Net Assets
do not include monies due the Partnership on futures interests, but not actu-
ally received.



Dean Witter Diversified Futures Fund III L.P.
Notes to Financial Statements--(Continued)

Net Income (Loss) per Unit--Net income (loss) per unit of limited partnership
interest ("Unit(s)") is computed using the weighted average number of Units
outstanding during the period.

Equity in Futures Interests Trading Accounts--The Partnership's asset "Equity
in futures interests trading accounts," reflected in the statements of finan-
cial condition, consists of (A) cash on deposit with DWR and Carr to be used as
margin for trading and (B) net unrealized gains or losses on open contracts,
which are valued at market, and calculated as the difference between original
contract value and market value.

The Partnership, in the normal course of business, enters into various con-
tracts with Carr acting as its commodity broker. Pursuant to brokerage agree-
ments with Carr, to the extent that such trading results in unrealized gains or
losses, the amounts are offset and reported on a net basis in the Partnership's
statements of financial condition.

The Partnership has offset the fair value amounts recognized for forward con-
tracts executed with the same counterparty as allowable under terms of the mas-
ter netting agreement with Carr, the sole counterparty on such contracts. The
Partnership has consistently applied its right to offset.

Brokerage Commissions and Related Transaction Fees and Costs--Brokerage commis-
sions are accrued at 80% of DWR's published non-member rates on a half-turn ba-
sis. Transaction fees and costs are accrued on a half-turn basis. Brokerage
commissions and transaction fees combined are capped at 13/20 of 1% per month
(a maximum 7.8% annual rate) of the Partnership's Net Assets as of the last day
of each month.

Operating Expenses--The Partnership bears all operating expenses related to its
trading activities, to a maximum of 3/5 of 1% annually of the Partnership's av-
erage month-end Net Assets. These include filing fees, clerical, administra-
tive, auditing, accounting, mailing, printing and other incidental operating
expenses as permitted by the Limited Partnership Agreement. In addition, the
Partnership incurs a monthly management fee and may incur an incentive fee. De-
meter bears all other operating expenses.

Income Taxes--No provision for income taxes has been made in the accompanying
financial statements, as partners are individually responsible for reporting
income or loss based upon their respective share of the Partnership's revenues
and expenses for income tax purposes.

Distributions--Distributions, other than redemptions of Units, are made on a
pro-rata basis at the sole discretion of Demeter. No distributions have been
made to date.


Dean Witter Diversified Futures Fund III L.P.
Notes to Financial Statements--(Continued)

Redemptions--Limited Partners are able to redeem some or all of their Units at
100% of the Net Asset Value per Unit as of the end of any month upon five busi-
ness days advance notice by redemption form to Demeter.

Dissolution of the Partnership--The Partnership will terminate on December 31,
2025 or at an earlier date if certain conditions set forth in the Limited Part-
nership Agreement occur.

2. Related Party Transactions

The Partnership pays brokerage commissions to DWR as described in Note 1. The
Partnership's cash is on deposit with DWR and Carr in futures interests trading
accounts to meet margin requirements as needed. DWR pays interest on these
funds as described in Note 1.

Demeter, on behalf of the Partnership and itself, entered into a Management
Agreement with DWFCM to make all trading decisions for the Partnership.

Compensation to DWFCM by the Partnership consists of a management fee and an
incentive fee as follows:

Management Fee--The monthly management fee is accrued daily at the rate of 1/4
of 1% per month of the Net Assets (a 3% annual rate), as defined in the Manage-
ment Agreement, at each month-end.

Incentive Fee--The Partnership will pay a quarterly incentive fee to DWFCM
equal to 15% of the trading profits earned by the Partnership as of the end of
each calendar quarter. Trading profits represent the amount by which profits
from futures, forward and options trading exceed losses after brokerage commis-
sions, management fees, transaction fees and costs and administrative expenses
are deducted. Such incentive fee is accrued in each month in which trading
profits occur. In those months in which trading profits are negative, previous
accruals, if any, during the incentive period will be reduced.

3. Financial Instruments

The Partnership trades commodity futures contracts and forward contracts, phys-
ical commodities, and other commodity interests. Futures and forwards represent
contracts for delayed delivery of an instrument at a specified date and price.
Risk arises from changes in the value of these contracts and the potential in-
ability of counterparties to perform under the terms of the contracts. There
are numerous factors which may significantly influence the market value of
these contracts, including interest rate volatility.


Dean Witter Diversified Futures Fund III L.P.
Notes to Financial Statements--(Continued)

In June 1998, the Financial Accounting Standards Board ("FASB") issued State-
ment of Financial Accounting Standard ("SFAS") No. 133, "Accounting for Deriva-
tive Instruments and Hedging Activities" effective for fiscal years beginning
after June 15, 1999. In June 1999, the FASB issued SFAS No. 137, "Accounting
for Derivative Instruments and Hedging Activities--Deferral of the Effective
Date of SFAS No. 133," which defers the required implementation of SFAS No. 133
until fiscal years beginning after June 15, 2000. However, the Partnership had
previously elected to adopt the provisions of SFAS No. 133 beginning with the
fiscal year ended December 31, 1998. SFAS No. 133 supersedes SFAS No. 119 and
No. 105, which required the disclosure of average aggregate fair values and
contract/ notional values, respectively, of derivative financial instruments
for an entity which carries its assets at fair value. The application of SFAS
No. 133 does not have a significant effect on the Partnership's financial
statements.

The net unrealized gains on open contracts are reported as a component of "Eq-
uity in futures interests trading accounts" on the statements of financial con-
dition and totaled $1,959,828 and $1,769,839 at December 31, 1999 and 1998, re-
spectively.

Of the $1,959,828 net unrealized gain on open contracts at December 31, 1999,
$1,781,996 related to exchange-traded futures contracts and $177,832 related to
off-exchange-traded forward currency contracts.

Of the $1,769,839 net unrealized gain on open contracts at December 31, 1998,
$4,225,604 related to exchange-traded futures contracts and ($2,455,765) re-
lated to off-exchange-traded forward currency contracts.

Exchange-traded futures contracts held by the Partner-ship at December 31, 1999
and 1998 mature through September 2000 and June 1999, respectively. Off-ex-
change-traded forward currency contracts held by the Partnership at December
31, 1999 and 1998 mature through March 2000 and April 1999, respectively.

The Partnership has credit risk associated with counterparty nonperformance.
The credit risk associated with the instruments in which the Partnership is in-
volved is limited to the amounts reflected in the Partnership's statements of
financial condition.

The Partnership also has credit risk because DWR and Carr act as the futures
commission merchants or the counterparties, with respect to most of the Part-
nership's assets. Exchange-traded futures contracts are marked to market on a
daily basis, with variations in value settled on a daily basis. Each of DWR and
Carr, as a futures


Dean Witter Diversified Futures Fund III L.P.
Notes to Financial Statements--(Continued)

commission merchant for the Partnership's exchange traded-futures contracts,
are required, pursuant to regulations of the Commodity Futures Trading Commis-
sion, to segregate from their own assets, and for the sole ben efit of their
commodity customers, all funds held by them with respect to exchange-traded
futures contracts including an amount equal to the net unrealized gain on all
open futures contracts, which funds totaled $49,560,814 and $67,947,328 at De-
cember 31, 1999 and 1998, respectively. With respect to the Partnership's off-
exchange-traded forward currency contracts, there are no daily settlements of
variations in value nor is there any requirement that an amount equal to the
net unrealized gain on open forward contracts be segregated. With respect to
those off-exchange-traded forward currency contracts, the Partnership is at
risk to the ability of Carr, the sole counterparty on all of such contracts, to
perform. The Partnership has a netting agreement with Carr. This agreement,
which seeks to reduce both the Partnership's and Carr's exposure on off-ex-
change-traded forward currency contracts, should materially decrease the Part-
nership's credit risk in the event of Carr's bankruptcy or insolvency. Carr's
parent, Credit Agricole Indosuez, has guaranteed to the Partnership payment of
the net liquidating value of the transactions in the Partnership's account with
Carr (including foreign currency contracts).

4. Legal Matters

The class actions first filed in 1996 in California and in New York State
courts were each dismissed in 1999. On September 6, 10, and 20, 1996, and on
March 13, 1997, purported class actions were filed in the Superior Court of the
State of California, County of Los Angeles, on behalf of all purchasers of in-
terests in limited partnership commodity pools sold by DWR. Named defendants
include DWR, DWFCM, Demeter, MSDW, the Partnership, certain limited partnership
commodity pools of which Demeter is the general partner (all such parties re-
ferred to hereafter as the "Morgan Stanley Dean Witter Parties") and certain
trading advisors to those pools. On June 16, 1997, the plaintiffs in the above
actions filed a consolidated amended complaint, alleging, among other things,
that the defendants committed fraud, deceit, negligent misrepresentation, vari-
ous violations of the California Corporations Code, intentional and negligent
breach of fiduciary duty, fraudulent and unfair business practices, unjust en-
richment, and conversion in the sale and operation of the various limited part-
nership commodity pools. The complaints seek unspecified amounts of compensa-
tory and punitive damages and other relief. The court entered an order denying
class certification on August 24, 1999. On September 24, 1999, the court en-


Dean Witter Diversified Futures Fund III L.P.
Notes to Financial Statements--(Concluded)

tered an order dismissing the case without prejudice on consent. Similar pur-
ported class actions were also filed on September 18 and 20, 1996, in the Su-
preme Court of the State of New York, New York County, and on November 14, 1996
in the Superior Court of the State of Delaware, New Castle County, against the
Morgan Stanley Dean Witter Parties and certain trading advisors on behalf of
all purchasers of interests in various limited partnership commodity pools, in-
cluding the Partnership, sold by DWR. A consolidated and amended complaint in
the action pending in the Supreme Court of the State of New York was filed on
August 13, 1997, alleging that the defendants committed fraud, breach of fidu-
ciary duty, and negligent misrepresentation in the sale and operation of the
various limited partnership commodity pools. The complaints seek unspecified
amounts of compensatory and punitive damages and other relief. The New York Su-
preme Court dismissed the New York action in November 1998, but granted plain-
tiffs leave to file an amended complaint, which they did in early December
1998. The defendants filed a motion to dismiss the amended complaint with prej-
udice on February 1, 1999. By decision dated December 21, 1999, the New York
Supreme Court dismissed the case with prejudice.

In addition, on December 16, 1997, upon motion of the plaintiffs, the action
pending in the Superior Court of the State of Delaware was voluntarily dis-
missed without prejudice.

5. Subsequent Event

On March 3, 2000, the plaintiffs in the New York action referred to in Note 4
filed an appeal of the order dismissing the consolidated complaint.


MORGAN STANLEY DEAN WITTER & CO.
Two World Trade Center
62nd Floor
New York, NY 10048

Presorted
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