William Carter may refer to:

• William Carter (martyr) (c. 1548–1584), English printer and martyr
• William Blount Carter (1792–1848), American politician from Tennessee
• William Carter (Tasmanian politician) (1796–1878), first mayor of Hobart
• William Grayson Carter (died 1849), American politician from Kentucky
• William Carter (cricketer, born 1822) (1822–1847), English cricketer
• William Carter (Wisconsin politician) (1833–1905), American politician from Wisconsin
• William Carter (Surrey cricketer) (1841–1888), English cricketer
• William Carter (bishop) (1850–1941), Anglican bishop in Africa
• William Carter (ink maker) (died 1895), American founder of what became Carter's Ink Company
• Sir William Carter (mayor) (1848–1932), mayor of Windsor, England, 1908–1928
• William Harding Carter (1851–1925), United States Army major general and Medal of Honor recipient
• William Carter (Mansfield MP) (1862–1932), British Labour Party Member of Parliament for Mansfield, 1918–1922
• William Henry Carter (1864–1955), United States Representative from Massachusetts
• William Carter (St Pancras South West MP) (1867–1940), British Labour Party Member of Parliament for St Pancras South West, 1929–1931
• William Leonard Carter (1877–1917), British businessman and army officer
• William Hodding Carter, I (1881–1955), American businessman, Democratic politician, and farmer from Louisiana
• William Carter (actor) (1902–1952), Australian silent film actor and company director
• William Arnold Carter (1907–1996), American Governor of the Panama Canal Zone, 1960–1962
• Will Carter (1912–2001), owner of the Rampant Lions Press and font designer
• William Lacy Carter (1925–2017), American politician and businessman
• William Carter (photographer) (born 1934), American photographer
• William Carter (Queensland politician) (1899–1969), publican and member of the Queensland Legislative Assembly
• Billy Carter (1937–1988), younger brother of American President Jimmy Carter
• Billy Carter (ice hockey) (born 1937), retired Canadian ice hockey forward
• Bill Carter (born 1966), American film director
• W. Beverly Carter Jr. (1921–1982), American ambassador