UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q /A

Quarterly Report Under Section 13 or 15(d)

of the Securities Exchange Act of 1934

For Quarterly Period Ended March 31, 2011

Commission File Number 1-7107

LOUISIANA-PACIFIC CORPORATION

(Exact name of registrant as specified in its charter)

414 Union Street, Nashville, TN 37219

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (615) 986-5600

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 whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definition of “large accelerated filer,” “accelerated filers” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date: 132,151,000 shares of Common Stock, $1 par value, outstanding as of May 1, 2011.

Except as otherwise specified and unless the context otherwise requires, references to “LP”, the “Company”, “we”, “us”, and “our” refer to Louisiana-Pacific Corporation and its subsidiaries.

EXPLANATORY NOTE

The sole purpose of this Amendment No. 1 to Louisiana-Pacific Corporation’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2011 filed with the Securities and Exchange Commission on May 9, 2011 (“the Form 10-Q”) is to furnish Exhibit 101 to the Form 10-Q. Exhibit 101 consists of the following, formatted in XBRL (eXtensible Business Reporting Language):

No other changes have been made to the Form 10-Q. The Form 10-Q has not been updated to reflect events occurring subsequent to the original filing date.

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Item 6. Exhibits

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SIGNATURES

Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

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