These are lists of the major tenants of the former World Trade Center in New York City at the time of the attacks in 2001. Three World Trade center was a hotel owned by Marriott.
- One World Trade Center included the Port Authority of New York and New Jersey, Marsh USA, Cantor Fitzgerald, Dai-Ichi Kangyo Group, Sidley Austin Brown & Wood, and Windows on the World.
- Two World Trade Center included Verizon, the New York Stock Exchange, Morgan Stanley, Xerox Corporation, Keefe, Bruyette & Woods, and Aon Corporation, and Fiduciary Trust Company International.
- Four World Trade Center included Deutsche Bank and the New York Board of Trade.
- Five World Trade Center included Credit Suisse First Boston and Morgan Stanley.
- Six World Trade Center included the United States Department of Commerce, Bureau of Alcohol, Tobacco, Firearms, and Explosives, and the United States Department of Labor.
- Seven World Trade Center included Salomon Smith Barney, the U.S. Securities and Exchange Commission, Standard Chartered Bank, and the U.S. Secret Service.