Starwood Hotels and Resorts Worldwide, Inc. is an American hotel and leisure company headquartered in Stamford, Connecticut. One of the world's largest hotel companies, it owns, operates, franchises and manages hotels, resorts, spas, residences, and vacation ownership properties under its nine owned brands. As of 1 December 2012, Starwood Hotels and Resorts Worldwide, Inc. owned, managed, or franchised 1,162 properties employing over 171,000 people, of whom approximately 26% were employed in the United States.
Starwood Hotels and Resorts was originally formed by the real estate investment firm Starwood Capital to take advantage of a tax break; at the time the company was known as Starwood Lodging. Initially, Starwood Lodging owned a number of hotels throughout North America, all under different brand names. The Westin Hotel Company was purchased in 1994 from Aoki Corporation of Japan. Starwood acquired the Sheraton, Four Points by Sheraton, and The Luxury Collection brands from ITT Sheraton in 1998.

In 1999, Starwood launched their "W" Hotels brand. In September 2005, Starwood announced the launch of Aloft, a new hotel brand based on W. Aloft Hotels catered toward business travelers. In 2005, Starwood purchased the Le Méridien brand.

In 2004, Starwood's founder and CEO Barry Sternlicht stepped down as CEO to focus his attention on his other firm, Starwood Capital. He remained on the Board of Directors until 2005. He was succeeded as CEO by Steven J. Heyer, and Starwood began selling a number of its company-owned hotels, instead focusing on becoming a management company and franchiser for its current and future hotel brands. In April 2007, Steven J. Heyer left the company on the request of the Board of Directors because of an issue with Heyer's management style and after allegations of personal misconduct. Chairman of the Board Bruce Duncan served as interim CEO until September 2007, when the company announced Heyer's successor, Frits van Paasschen.

Starwood also has customer contact centers (CCC) all over the world. A new CCC was just opened in Wichita, KS. This makes it 10 CCC worldwide. The other locations are in Austin, Texas; Fall River, Massachusetts; Lancaster, California; St. Thomas, Ontario, Canada; Cork, Ireland; Singapore; Tokyo, Japan; Guangzhou, China; and Gurgaon, India.