William Caldwell

William Caldwell may refer to:

Military

 * William Caldwell (ranger) (c. 1750–1822), Irish-Canadian soldier in the American Revolution and War of 1812
 * William B. Caldwell III (1925–2013), U.S. Army general
 * William B. Caldwell IV (born 1954), U.S. Army general, son of William B. Caldwell III

Law

 * William B. Caldwell (judge) (1808–1876), American judge
 * William W. Caldwell (1925–2019), American federal judge

Politics

 * William Caldwell (Halifax mayor), former mayor of Halifax, Nova Scotia
 * William Caldwell (Wisconsin politician), member of the 1st Wisconsin legislature of 1848
 * William Bletterman Caldwell (1798–1892), governor of the Red River Settlement
 * William Clyde Caldwell (1843–1905), Ontario businessman and politician
 * William Murray Caldwell (1832–1870), New Brunswick businessman and political figure
 * William Parker Caldwell (1832–1903), member of the United States House of Representatives

Other fields

 * William Caldwell (Royal Navy officer), (died 1718), British admiral
 * William Caldwell (hymnist) (1801–1857), who compiled a hymn and tune book Union Harmony
 * William Caldwell (cricketer) (1878–1964), English cricketer
 * William A. Caldwell (1906–1986), American journalist and columnist
 * William Hay Caldwell (1859–1941), Scottish biologist.