William Brewster
William Brewster is the name of the following people:
- William Brewster (Presbyter) (1566–1644), English church elder and a leading figure in the Plymouth Colony
- William Brewster (ornithologist) (1851-1919), American ornithologist
- William K. Brewster (* 1941), American politician
- William R. Brewster (1828–1869), American brigadier general in the Union Army