William Houstoun may refer to:
- William Houstoun (botanist) (1695–1733), British surgeon and botanist
- William Houston (1746–1788), American teacher and statesman
- William Houstoun (lawyer) (1755–1813), American lawyer, Continental Congressman for Georgia
- Sir William Houstoun, 1st Baronet (1766–1842), British army officer, Governor of Gibraltar
This disambiguation page lists articles about people with the same name.
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