American International Group, Inc. (AIG) (NYSE: AIG), also known as AIU Holdings, Inc., is an American insurance corporation. Its corporate headquarters are located in the American International Building in New York City. The British headquarters office is on Fenchurch Street in London; continental Europe operations are based in La Défense, Paris, and its Asian headquarters office is in Hong Kong. According to the 2008 Forbes Global 2000 list, AIG was once the 18th-largest public company in the world. It was listed on the Dow Jones Industrial Average from April 8, 2004 to September 22, 2008.

AIG suffered from a liquidity crisis when its credit ratings were downgraded below "AA" levels in September 2008. The United States Federal Reserve Bank on September 16, 2008, created an $85 billion credit facility to enable the company to meet increased collateral obligations consequent to the credit rating downgrade, in exchange for the issuance of a stock warrant to the Federal Reserve Bank for 79.9% of the equity of AIG. The U.S. government revised the credit facility, and eventually increased the total amount available to as much as $182.5 billion. AIG subsequently sold a number of its subsidiaries and other assets to pay down loans received, and continues to seek buyers of its assets. In March 2009, AIG faced public outrage and media and political backlash for its retention payments of $165 million. AIG employees faced hate mail and death threats, and multiple websites had sprung up attacking AIG. As a result of public furor over retention payments to its employees, AIG is re-branding a majority of its business under AIU Holdings, Inc.. FBIC, a non-profit organization fighting bad-faith insurance companies, ranks AIG eighth on its list of bad-faith insurers in a review of 655 insurer groups comprising of 3,693 insurer companies.

AIG history dates back to 1919, when Cornelius Vander Starr established an insurance agency in Shanghai, China. Starr was the first Westerner in Shanghai to sell insurance to the Chinese, which he continued to do until AIG left China in early 1949—as Mao Zedong led the advance of the Communist People's Liberation Army on Shanghai. Starr then moved the company headquarters to its current home in New York City. The company went on to expand, often through subsidiaries, into other markets, including other parts of Asia, Latin America, Europe, and the Middle East.