William Connolly may refer to:
William Connolly (fur trader) (1786–1849), Anglo-Canadian fur trader William Connolly (VC) (c. 1816–1891), English recipient of the Victoria Cross William Connolly (piper) (1839–1870s), Irish piper Bobby Connolly (William Harold Connolly, 1897–1944), American film director and choreographer William G. Connolly (1937–2023), co-author of The New York Times style guide William E. Connolly (1938–2026), American political theorist and academic William M. Connolly (born 1938), justice of the Nebraska Supreme Court Billy Connolly (born 1942), Scottish comedian William "Egg Boy" Connolly (born 2001), egged Australian Senator Fraser Anning
See also William Conley (disambiguation) William Conolly (1662–1729), Irish politician William James Conolly (died 1754), Irish politician William Warren Conolly (1920–2008), Cayman Islands politician William Connelly (disambiguation) William Connolley (born 1964), British software engineer, writer, and blogger on climatology