American Express ( ), sometimes known as "AmEx" or "Amex", is a diversified global financial services company, headquartered in New York City. The company is best known for its credit card, charge card and traveler's cheque businesses.

The company's common stock trades on the New York Stock Exchange under the ticker symbol "AXP." It is one of the 30 stocks that comprise the Dow Jones Industrial Average and is ranked as the 74 th largest company by Fortune. In 2007, BusinessWeek and Interbrand ranked American Express as the 15 th most valuable brand in the world, estimating the brand to be worth US$20.87 billion.

The current CEO is Kenneth Chenault, who took over in 2001.