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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

FOR THE FISCAL YEAR ENDED DECEMBER 31, 2004

COMMISSION FILE NUMBERS 333-72913 AND 2-89905-01

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY IN RESPECT OF NML VARIABLE ANNUITY ACCOUNT A & NML VARIABLE ANNUITY ACCOUNT C

(Exact name of registrant as specified in its charter)

REGISTRANT’S TELEPHONE NUMBER, INCLUDING AREA CODE: (414) 271-1444

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT: NONE

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 is not contained herein, and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. x

Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act). Yes ¨ No x

State the aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant’s most recently completed second fiscal quarter. NOT APPLICABLE

Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of the latest practicable date. NONE

DOCUMENTS INCORPORATED BY REFERENCE

NONE

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THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY IN RESPECT OF

NML VARIABLE ANNUITY ACCOUNT A AND NML VARIABLE ANNUITY ACCOUNT C

FORM 10-K

PART I

ACCOUNTS A & C

NML Variable Annuity Account A (“Account A”) and NML Variable Annuity Account C (“Account C”) are segregated asset accounts of The Northwestern Mutual Life Insurance Company (“Northwestern Mutual”) formed to provide retirement annuity benefits for (i) self-employed individuals (and their eligible employees) who adopt plans (“HR-10 Plans”) meeting the requirements of Sections 401 or 403(a) of the Internal Revenue Code of 1986, as amended (the “Code”) and (ii) employees of corporate employers who adopt pension or profit sharing plans meeting the requirements of Section 401(a) of the Code, or annuity purchase plans meeting the requirements of Section 403(a) of the Code (collectively, “Corporate Plans”). Account A receives payments under individual variable annuity contracts issued by Northwestern Mutual in connection with HR-10 Plans and Corporate Plans. Account C receives payments under group combination variable annuity contracts issued by Northwestern Mutual in connection with HR-10 Plans and Corporate Plans. The variable annuity contracts issued by Northwestern Mutual in connection with HR-10 Plans and Corporate Plans are hereinafter referred to as the “Contracts.” Account A and Account C were established on February 14, 1968 and July 22, 1970, respectively, by action of the Board of Trustees of Northwestern Mutual in accordance with the provisions of Wisconsin insurance law. Neither Account A nor Account C is registered as an investment company under the Investment Company Act of 1940.

The Contracts provide for the accumulation of funds and the payment of retirement benefits to participants and their beneficiaries (“Annuitants”). Account A and Account C each have 24 divisions. Money invested to provide variable benefits under the Contracts is placed in one or more divisions of the applicable Account which are in turn invested in 18 portfolios of Northwestern Mutual Series Fund, Inc. (Small Cap Growth Stock Portfolio, T. Rowe Price Small Cap Value Portfolio, Aggressive Growth Stock Portfolio, International Growth Portfolio, Franklin Templeton International Equity Portfolio, AllianceBernstein Mid Cap Value Portfolio, Index 400 Stock Portfolio, Janus Capital Appreciation Portfolio, Growth Stock Portfolio, Large Cap Core Stock Portfolio, Capital Guardian Domestic Equity Portfolio, T. Rowe Price Equity Income Portfolio, Index 500 Stock Portfolio, Asset Allocation Portfolio, Balanced Portfolio, High Yield Bond Portfolio, Select Bond Portfolio, and Money Market Portfolio), the Fidelity VIP Mid Cap Portfolio (a fund of Variable Insurance Products Fund III), and 5 funds of Russell Investment Funds (Multi-Style Equity Fund, Aggressive Equity Fund, Non-U.S. Fund, Real Estate Securities Fund and Core Bond Fund), each of which corresponds to one of the Account divisions, all as directed by the Annuitant. Northwestern Mutual Series Fund, Inc. and Russell Investment Funds, which are sponsored by Northwestern Mutual and a Northwestern Mutual affiliate, respectively, and Variable Insurance Products Fund III, which is not affiliated with Northwestern Mutual, are each registered as investment companies under the Investment Company Act of 1940. The Contracts also permit investment on a fixed basis, at rates determined by Northwestern Mutual. The Contracts are sold through individuals who, in addition to being licensed insurance agents of Northwestern Mutual, are registered representatives of Northwestern Mutual Investment Services, LLC (“NMIS”), a wholly-owned company of Northwestern Mutual and a registered broker-dealer under the Securities Exchange Act of 1934.

Under Wisconsin law, the investment operations of each of Account A and Account C (other than those Contract investments for which the fixed rate option is selected) are kept separate from the operations of Northwestern Mutual. Northwestern Mutual and its creditors cannot reach assets in Account A or Account C to satisfy non-Contract related obligations until all obligations under the Contracts have been satisfied.

See Item 6 herein for Account A and Account C historical financial information regarding results of operations, changes in equity and total assets. See Item 8 herein for the audited financial statements of Account A and Account C.

NORTHWESTERN MUTUAL

Founded in 1857, Northwestern Mutual is a mutual insurance company organized under the laws of the State of Wisconsin. Northwestern Mutual’s products consist of a wide range of permanent and term life insurance, disability income insurance and annuities for the personal, business, estate planning and pension markets. Mutual funds, equity and debt securities, long-term care insurance and trust services are offered and/or sold through subsidiaries. Northwestern Mutual markets its insurance products and services in all 50 states of the United States and in the District of Columbia through an exclusive network of approximately 7,700 financial representatives at December 31, 2004 located in approximately 330 offices nationwide. At

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December 31, 2004, Northwestern Mutual had approximately 4,600 full- and part-time employees. Northwestern Mutual’s website address is www.nmfn.com.

Northwestern Mutual’s principal lines of business are: (i) life insurance, which provides a wide range of individual life insurance products, including traditional whole life, permanent and term combination, variable life and term policies to meet the needs of middle to upper income individuals, small business owners and professionals, estates and selected large corporations; (ii) disability income insurance, which provides a line of individual and group products, including individual non-cancelable, guaranteed renewable loss of earnings, buyout, key person, and short-term and long-term group coverages, marketed primarily to middle to upper income individuals, professionals, and small- to medium-sized businesses and their owners; (iii) investment products and services, which provide individual variable, fixed and immediate annuities offered in conjunction with qualified pension plans, retirement plans for self-employed individuals, individual retirement and personal non-tax qualified situations, group annuities, retail mutual funds (including associated funds offered by Mason Street Funds, Inc. and Frank Russell Investment Company), brokerage services (offered through its subsidiary Northwestern Mutual Investment Services, LLC) and trust services (offered through its subsidiary Northwestern Mutual Trust Company), marketed primarily to middle to upper income individuals, business owners and professionals; and (iv) long-term care insurance, offered through its subsidiary Northwestern Long Term Care Insurance Company, marketed primarily to middle to upper income individuals, small business owners and professionals. For the years ended December 31, 2004, 2003 and 2002, Northwestern Mutual had (a) total premiums of $10.7 billion, $10.3 billion and $10.1 billion, respectively, of which $9.0 billion, $8.7 billion and $8.6 billion, respectively, was attributable to life insurance, $0.7 billion, $0.7 billion and $0.6 billion, respectively, was attributable to disability income insurance, and $1.0 billion, $0.9 billion and $0.9 billion, respectively, was attributable to annuity products in the investment products and services line of business; (b) net income of $817 million, $692 million and $158 million, respectively, of which $597 million, $493 million and $(18) million, respectively, was attributable to life insurance, $186 million, $179 million and $149 million, respectively, was attributable to disability income insurance, $41 million, $29 million and $44 million, respectively, was attributable to annuity products in the investment products and services line of business, and losses of $(7) million, $(9) million and $(17) million, respectively, was attributable to long term care insurance; and (c) total assets of $123.9 billion, $113.8 billion and $102.9 billion, respectively, of which $100.7 billion, $92.2 billion and $82.8 billion, respectively, was attributable to life insurance, $6.5 billion, $6.1 billion and $5.9 billion, respectively, was attributable to disability income insurance, and $16.7 billion, $15.5 billion and $14.2 billion, respectively, was attributable to annuity products in the investment products and services line of business.

The life insurance industry is mature and highly competitive. Competitiveness in the life insurance business is affected by various factors including, but not limited to, product quality, financial strength and stability, third party ratings, size and competence of agency force, product pricing and guarantees, range of product lines, customer service, and reputation. Based on total admitted statutory assets at September 30, 2004 (the most recent data available), Northwestern Mutual was the 4th largest U.S. domiciled life insurance company on an individual company basis and the 10th largest on a corporate family basis. During 2004, there were more than 1,000 life insurance companies doing business in the United States and many of these companies offer individual life insurance and annuity products similar to those offered by Northwestern Mutual. In addition, Northwestern Mutual competes with banks, brokerage firms, investment advisers, mutual funds and other financial entities for investment and savings customers. In the individual and group disability markets, Northwestern Mutual competes with a limited number of major national and regional companies offering these specialized products. In the long-term care business, Northwestern Mutual competes primarily with a limited number of national companies. National banks, with their pre-existing customer bases for financial services products, may pose increasing competition in the future to insurers who sell life insurance and annuity products, including Northwestern Mutual. United States Supreme Court decisions have expanded the authority of national banks to sell life insurance products and annuities. In addition, legislation enacted in 1999 to overturn Depression-era restrictions on bank affiliations, the Gramm-Leach-Bliley Act (the “Act”), implemented fundamental changes in the regulation of the financial services industry in the U.S. The Act eliminated certain barriers to and restrictions on affiliations between banks, securities firms and insurance companies that were previously contained in the Glass-Steagall Act of 1933, as amended, and the Bank Holding Company Act of 1956, as amended. Under the Act, through the use of two new structures, financial holding companies and financial subsidiaries, qualifying bank holding companies and state and national banks are allowed to provide a wide variety of financial services, including the authority to engage in certain insurance activities (e.g., the sale and, in the case of qualifying bank holding companies only, the underwriting of insurance and annuities). As a result of the Act, among other things, bank holding companies may acquire insurers and insurance holding companies may acquire banks. Over time, the Act may change the competitive and regulatory environment in which Northwestern Mutual and its subsidiaries conduct their businesses and may result in additional competition in one or more markets in which they sell their products and services.

Northwestern Mutual, and its insurance subsidiary Northwestern Long Term Care Insurance Company, are licensed to transact their insurance business in, and are subject to regulation and supervision by, all 50 states of the United States and the District of Columbia. The extent of such regulation varies, but most jurisdictions have laws and regulations governing the financial aspects of insurance companies, including standards of solvency, reserves, reinsurance, capital adequacy and the business

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conduct of insurance companies. In addition, statutes and regulations usually require the licensing of insurers and their agents, the approval of policy forms and related materials and, for certain lines of insurance, the approval of rates. Such statutes and regulations also prescribe the permitted types and concentration of investments. The Act reaffirms that the states remain responsible for regulating the business of insurance. However, subject to certain exceptions, no state authority can prevent or restrict depository institutions and their affiliates from affiliating with insurance companies as permitted under the Act. In addition, certain state laws and regulations that place restrictions on a depository institution’s insurance sales activities are preempted.

Frank Russell Company (“Russell”), a subsidiary of Northwestern Mutual, is a global investment services firm providing multi-manager investment products and services in 39 countries. Together with its subsidiaries, Russell managed $131.2 billion in assets at December 31, 2004 and advised clients representing $2.3 trillion in assets worldwide. Russell is also well known for its family of market indices, including the Russell 2000, which provide sets of performance benchmarks for investors.

NMIS, a wholly-owned company of Northwestern Mutual, is a full-service registered broker-dealer serving the investment planning and product needs of individuals and businesses. Through its registered representatives, NMIS offers mutual funds, variable annuities, variable life insurance products, stocks and bonds to its customers in more than 60 cities nationwide. NMIS is a member of the National Association of Securities Dealers, Inc.

See Item 15 herein for the audited consolidated financial statements of Northwestern Mutual.

PURPOSE OF ANNUAL REPORT

This Annual Report on Form 10-K is filed with respect to Account A and Account C of Northwestern Mutual. While certain information in this Form 10-K relates to Northwestern Mutual as a whole, this Form 10-K is intended to provide information with respect to such Account A and Account C where relevant.

Account A and Account C own no physical properties. Northwestern Mutual owns and occupies all of the space in its home office complex in Milwaukee and Franklin, Wisconsin. Northwestern Mutual, as lessee, also occupies temporary space in three buildings adjacent to its Milwaukee campus. Northwestern Mutual is the lessee of eight leases covering its real estate regional offices in locations throughout the United States. Russell leases its principal office space located in Tacoma, Washington as well as other office space within and outside the U.S. Northwestern Mutual believes that its owned and leased properties are suitable and adequate for its current operations.

Neither Account A nor Account C are parties to any pending legal proceedings. Northwestern Mutual is subject to various claims and proceedings, including claims or proceedings related to its investments, that occur in the ordinary course of its business. Based on information currently available to Northwestern Mutual, Northwestern Mutual believes that none of these current claims or proceedings, either individually or in the aggregate, will have a material adverse effect on the financial position of Northwestern Mutual.

Not applicable.

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PART II

As segregated asset accounts, Account A and Account C do not issue common equity securities. As a mutual life insurance company, Northwestern Mutual does not issue common equity securities.

The Contracts issued in connection with Account A and Account C, and interests in those Contracts, are offered on a continuous basis to Corporate Plans and HR-10 Plans. The Contracts for Corporate Plans are not registered under the Securities Act of 1933 in reliance on the exemption provided by Section 3(a)(2) thereof. All of the Contracts are offered exclusively by financial representatives of Northwestern Mutual who are also registered representatives of NMIS.

During 2004, the following aggregate dollar amounts of such unregistered securities were sold to Corporate Plans, generating the aggregate commissions stated:

Accumulation units in Account A and Account C represent the interests of Contract owners. Purchase payments are applied to credit additional accumulation units based on the accumulation unit value next determined after each payment is received in good order. Accumulation units are valued as of the close of business on the New York Stock Exchange for each day the Exchange is open, and at any other time required by the Investment Act of 1940.

The following tables set forth selected historical financial data for Account A for the five years in the period ended December 31, 2004. The data should be read in conjunction with the financial statements and notes thereto of Account A contained in Item 8 of this Annual Report.

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RESULTS OF OPERATIONS FOR ACCOUNT A

(IN THOUSANDS)

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CHANGES IN EQUITY FOR ACCOUNT A

(IN THOUSANDS)

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TOTAL ASSETS OF ACCOUNT A

(IN THOUSANDS)

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The following tables set forth selected historical financial data for Account C for the five years in the period ended December 31, 2004. The data should be read in conjunction with the financial statements and notes thereto of Account C contained in Item 8 of this Annual Report.

RESULTS OF OPERATIONS FOR ACCOUNT C

(IN THOUSANDS)

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RESULTS OF OPERATIONS FOR ACCOUNT C

(IN THOUSANDS)

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CHANGES IN EQUITY FOR ACCOUNT C

(IN THOUSANDS)