William Houstoun

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