美国铝业公司（Alcoa），简称美铝，是继力拓集团（Rio Tinto Group）及俄罗斯铝业集团（RUSAL）世界第三大铝材生产商，于1888年由查尔斯·马丁·霍尔创立，现在在美国纽约证券交易所上市。

美国铝业公司总部位于美国宾夕法尼亚州匹兹堡，监察着遍布44个国家的业务。紧随其后的是曾为它子公司－加拿大铝业集团(Alcan)。根据销售成绩，加拿大铝业集团超越了美国铝业公司。

2007年5月7日，美国铝业公司向加拿大铝业集团开展了总值270亿美元的敌意收购，打算结合成世界上最大的铝材生产商。当力拓集团在2007年7月12日向加拿大铝业集团提出善意收购后，美国铝业公司便把计划取消。

Alcoa Inc. (from Aluminum Company of America) is an American public company best known for its work with lightweight metals and advanced manufacturing techniques. The world's third largest producer of aluminum, behind Chinalco and Rusal, the company has corporate headquarters in New York City. From its operational base in Pittsburgh, Pennsylvania in the United States, Alcoa conducts operations in 30 countries. It is one of the world's largest lightweight metal manufacturers of products made of aluminum, titanium and nickel. Alcoa’s products are used worldwide in aircraft, automobiles, commercial transportation, packaging, building and construction, oil and gas, defense, and industrial applications. Alcoa's products include fastening systems for the Airbus A380 jet, sheets for Ford's F-150 truck, and the first aluminum fan blade for Pratt & Whitney jet engines. Alcoa also supplies aerospace-grade aluminum produced in South Korea to Samsung Electronics for its Galaxy S6 and Galaxy S7 model line-up. Alcoa is a major producer of primary aluminum, fabricated aluminum, and alumina combined, through its participation in all major aspects of the industry: technology, mining, refining, smelting, fabricating, and recycling. As of 2015, the company has $36.7 billion in assets and 60000 employees.