William Wainwright may refer to:
- William John Wainwright (1855–1931), Birmingham artist
- William Wainwright (land developer) (1836–?), developer of Rockaway Beach, Queens in New York
- William L. Wainwright (born 1947), member of the North Carolina General Assembly
- William Orbit (William Mark Wainwright, born 1956), English musician and record producer