William Caldwell
William Caldwell may refer to:
Military
- William Caldwell (ranger), Irish-Canadian soldier in the American Revolution and War of 1812
- William B. Caldwell III, U.S. Army general
- William B. Caldwell IV, U.S. Army general, son of William B. Caldwell III
Law
- William B. Caldwell (judge), American judge
- William W. Caldwell, American federal judge
Politics
- William Caldwell (Illinois politician), 19th century Illinois state representative
- William Caldwell (Nova Scotia politician), former mayor of Halifax, Nova Scotia
- William Caldwell (Wisconsin politician), member of the 1st Wisconsin legislature of 1848
- William Bletterman Caldwell, governor of the Red River Settlement
- William Clyde Caldwell, Ontario businessman and politician
- William Murray Caldwell, New Brunswick businessman and political figure
- William Parker Caldwell, member of the United States House of Representatives
Other fields
- William Caldwell (Royal Navy officer),, British admiral
- William Caldwell (hymnist), who compiled a hymn and tune book Union Harmony
- William Caldwell (cricketer), English cricketer
- William A. Caldwell, American journalist and columnist
- William Hay Caldwell, Scottish biologist.