William Connolly
William Connolly may refer to:
- William Connolly (fur trader), Anglo-Canadian fur trader
- William Connolly (VC), English recipient of the Victoria Cross
- William Connolly (piper), Irish piper
- Bobby Connolly, American film director and choreographer
- William G. Connolly, co-author of The New York Times style guide
- William E. Connolly, professor of political science at Johns Hopkins University
- William M. Connolly, justice of the Nebraska Supreme Court
- Billy Connolly, Scottish comedian
- William "Egg Boy" Connolly, egged Australian Senator Fraser Anning