William Ellis
William Ellis may refer to:
- William Ellis (Secretary of State)
- Sir William Charles Ellis MD (1780–1839), physician, pioneering superintendent of asylums and Methodist lay preacher
- William Cox Ellis (1787–1871), member of the United States House of Representatives from Pennsylvania
- William Ellis (engraver)
- William Ellis (economist) (1800-1881)
- William Ellis (writer on agriculture)
- William Craven-Ellis (1880–1959), Conservative Party politician in the United Kingdom
- William Henry Ellis (1860–1945), British civil engineer and steel maker
- William R. Ellis (1850–1915), United States Congressman from Oregon from 1893–1899 and 1907–1911
- William Thomas Ellis (1845–1925), U.S. Representative from Kentucky
- William Webb Ellis (1806–1872), man who is said to have invented rugby
- William Ellis (Medal of Honor), Medal of Honor recipient
- William Ellis (cricketer) (1876–1931), cricketer for Derbyshire
- William Ellis (mayor), 19th mayor of Hoboken, New Jersey; see List of Hoboken Mayors
- William Ellis (missionary) (1794–1872), missionary and author from London
- William Ellis (naturalist), naturalist on James Cook's third voyage (1776–1779)
- William Ellis (Solicitor General) (1607–1680), English lawyer and politician
- Billy Ellis (born 1895), English footballer
- Bill Ellis (born 1950), American folklorist
See also