William Birch
William Birch, Bill Birch or Billy Birch may refer to:
- Bill Birch, New Zealand politician
- Bill Birch (footballer), English and Australian footballer and coach
- Billy Birch, American minstrel performer
- William Birch (Australian cricketer), Australian cricketer
- William Birch (English cricketer), English cricketer
- William Birch (footballer), English footballer
- William Birch (painter), English and US miniature painter, enameler and engraver
- William Birch (settler), English settler in North Island, New Zealand
- William Fred Birch, American politician
- William John Birch, English freethinker