William Sawyer may refer to:
- William Sawyer (cricketer), 18th-century English cricketer
- William Sawyer (representative), member of the US house of Representatives from Ohio in the 1840s
- William B. Sawyer (1886-1950), Miami doctor
- William E. Sawyer, American inventor
- William James Sawyer, English accountant
- William Sawyer (politician), Canadian politician
- William Sawyer (composer) (1953-1991), author of the musical Babes
- William Collinson Sawyer (1831–1868) Anglican bishop