William Astor
William Astor may refer to:
- William Backhouse Astor Sr., American businessman and member of the Astor family
- William Backhouse Astor Jr., American businessman and son of the above
- William Waldorf Astor, American-born English politician and nephew of the above
- William Astor, 3rd Viscount Astor, English politician and grandson of the above
- William Astor, 4th Viscount Astor, English politician and son of the above