William Caldwell
William Caldwell may refer to:
- William Caldwell (cricketer), English cricketer
- 'William Caldwell', Field Maple cultivar named for eponymous nurseryman.
- William W. Caldwell (born 1925), U.S. federal judge
- William Caldwell (Halifax mayor), former mayor of Halifax, Nova Scotia
- William Caldwell (hymnist) (1801–1857), who compiled a hymn and tune book Union Harmony
- William Caldwell (ranger) (c.1750–1822), Irish-Canadian soldier in the American Revolution and War of 1812
- William A. Caldwell, the Pulitzer Prize winner
- William B. Caldwell, American U.S. Army Lieutenant General
- William B. Caldwell (judge) (1808-1876) Ohio judge
- William Bletterman Caldwell (1798–1892), governor of the Red River Settlement
- William Clyde Caldwell (1843–1905), Ontario businessman and politician
- William Parker Caldwell (1832–1903), member of the United States House of Representatives
- Billy Caldwell, Potawatomi leader
- Will Caldwell, Australian rugby union player
- Bill Caldwell (racing driver), New Zealand racing driver