William, Will, Bill, or Billy Gill may refer to:
Arts and entertainment William Ward Gill (1823–1894), English painter, brother of Edmund Marriner Gill William Henry Gill (composer) (1839–1923), Manx composer William Gill (dramatist) (1842–1919), American actor and playwright; author of Broadway's first hit musical, Adonis William Gill (photographer) (1854–1912), British photographer W. Walter Gill (William Walter Gill, 1876–1963), Manx scholar, folklorist and poet Will Gill (born 1968), Canadian artist
Sports Billy Gill (1876–1930), Australian rules footballer Bill Gill (soccer) (1919–?), Canadian soccer goalkeeper William Gill (boxer) (fl. 2007–2009), American boxer
Others William Gill (sea captain) (1795–1858), Manx master mariner William Wyatt Gill (1828–1896), English missionary William Gill (explorer) (1843–1882), British explorer and intelligence gatherer, companion of William Mesny William H. Gill (1886–1976), U.S. Army general William Henry Gill (ethnographer) (1861–1944), Australian ethnographer William Smith Gill (1865–1957), Scottish Volunteer Force officer and paint manufacturer William R. Gill, American diplomat
See also William McGill (disambiguation) William Gillies (disambiguation)