UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): October 14, 2011 (October 11, 2011)

ALCOA INC.

(Exact name of Registrant as specified in its charter)

Office of Investor Relations   212-836-2674

Office of the Secretary           212-836-2732

(Registrant’s telephone number, including area code)

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the Registrant under any of the following provisions:

On October 11, 2011, Alcoa Inc. held its third quarter 2011 earnings conference call, broadcast live by webcast. A transcript of the call and a copy of the slides presented during the call are attached hereto as Exhibits 99.1 and 99.2, respectively, and are hereby incorporated by reference.

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The information in this Current Report on Form 8-K, including Exhibits 99.1 and 99.2, is being furnished in accordance with the provisions of General Instruction B.2 of Form 8-K.

Forward-Looking Statements

Certain statements in this report relate to future events and expectations, and as such constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements also include those containing such words as “anticipates,” “estimates,” “expects,” “forecasts,” “intends,” “outlook,” “plans,” “projects,” “should,” “targets,” “will,” or other words of similar meaning. All statements that reflect Alcoa’s expectations, assumptions, or projections about the future other than statements of historical fact are forward-looking statements, including, without limitation, forecasts concerning global demand for aluminum, end-market conditions, growth opportunities for aluminum in automotive, aerospace and other applications or other trend projections, targeted financial results or operating performance, and statements about Alcoa’s strategies, objectives, goals, targets, outlook, and business and financial prospects. Forward-looking statements are subject to a number of known and unknown risks, uncertainties, and other factors and are not guarantees of future performance. Actual results, performance, or outcomes may differ materially from those expressed in or implied by those forward-looking statements. Important factors that could cause actual results to differ materially from those expressed or implied in the forward-looking statements include: (a) material adverse changes in aluminum industry conditions, including global supply and demand conditions and fluctuations in London Metal Exchange-based prices for primary aluminum, alumina, and other products; and fluctuations in indexed-based and spot prices for alumina; (b) global economic and financial market conditions generally, including the risk of another global economic downturn and uncertainties regarding the outcome or effects of sovereign debt issues or government intervention into the markets to address economic conditions; (c) unfavorable changes in the markets served by Alcoa, including automotive and commercial transportation, aerospace, building and construction, distribution, packaging, oil and gas, defense, and industrial gas turbine; (d) the impact of changes in foreign currency exchange rates on costs and results, particularly the Australian dollar, Brazilian real, Canadian dollar, euro, and Norwegian kroner; (e) increases in energy costs, including electricity, natural gas, and fuel oil, or the unavailability or interruption of energy supplies; (f) increases in the costs of other raw materials, including caustic soda or carbon products; (g) Alcoa’s inability to achieve the level of revenue growth, cash generation, cost savings, improvement in profitability and margins, fiscal discipline, or strengthening of operations (including moving its alumina refining and aluminum smelting businesses down on the industry cost curve and increasing revenues in its Flat-Rolled Products and Engineered Products and Solutions segments), anticipated from its productivity improvement, cash sustainability, and other initiatives; (h) Alcoa’s inability to realize expected benefits from newly constructed, expanded or acquired facilities or from international joint ventures as planned and by targeted completion dates, including the joint venture in Saudi Arabia or the upstream operations in Brazil; (i) political, economic, and regulatory risks in the countries in which Alcoa operates or sells products, including unfavorable changes in laws and governmental policies, civil unrest, and other events beyond Alcoa’s control; (j) the outcome of contingencies, including legal proceedings, government investigations, and environmental remediation; (k) the business or financial condition of key customers, suppliers, and business partners; (l) changes in tax rates or benefits; and (m) the other risk factors summarized in Alcoa’s Form 10-K for the

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year ended December 31, 2010, Forms 10-Q for the quarters ended March 31, 2011 and June 30, 2011, and other reports filed with the Securities and Exchange Commission. Alcoa disclaims any obligation to update publicly any forward-looking statements, whether in response to new information, future events or otherwise, except as required by applicable law.

The following are furnished as exhibits to this report:

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SIGNATURES

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

Dated: October 14, 2011

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EXHIBIT INDEX

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