William Willets Cocks (July 24, 1861 – May 24, 1932) was an American politician who served three terms from New York from 1905 to 1911.

Born in Old Westbury, Long Island, he attended private schools and Swarthmore College.

[citation needed] He was elected Commissioner of Highways of the Town of North Hempstead in 1894, and was re-elected in 1896 and again in 1898.

[1] William Cocks was a member of the board of managers of Swarthmore College and was president of the Friends Academy in Locust Valley.

His son, William Burling "Burley" Cocks (1915–1998) was a U.S. Hall of Fame trainer of Thoroughbred racehorses.