William Bull may refer to:
William Bull (diver) (1886–1970), British Olympic diver William Bull (governor) (1638–1755), landowner and politician in the province of South Carolina William Bull II (1710–1791), lieutenant governor of the province of South Carolina William Bull (minister) (1738–1814), English independent minister William Bull (botanist) (1828–1902), English botanist William Bull (landowner) (1867–1956), founder of Bilbul, a small town in New South Wales, Australia Sir William Bull, 1st Baronet (1863–1931), British solicitor and politician William Frederick Bull (1903–1993), Canadian diplomat William Ford Bull (1876–1941), American football player and coach William T. Bull (1865–1924), American football player and coach William L. Bull (1844–1914), American banker and president of the New York Stock Exchange
See also William "Bull" Nelson (1824–1862), American naval officer William "Bull" Halsey (1882–1959), American naval officer Bull (surname)