William Swainson may refer too:
- William Swainson, FLS, FRS, (1789-1855), was an English ornithologist, malacologist, conchologist, entomologist and artist.
- William Swainson (lawyer) (1809-1884), was an English lawyer who helped to set up the legal system of New Zealand.
See also
- Isaac Swainson, (1746-1812), the genus Swainsona are named after him, William Swainson's (1789-1855) cousin.
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