Others
- Bill Stewart (programmer) (1950–2009), American software creator
- William Stewart (biologist) (born 1935), Scottish microbiologist
- William George Drummond Stewart (1831–1868), Scottish recipient of Victoria Cross; Crimean War veteran
- William Robert Stewart (died 1818), American ship captain
- William Boyd Stewart (1835–1912), Canadian pastor, writer, and educator
- William Drummond Stewart (1795–1871), Scottish adventurer and British military officer
- William Kilpatrick Stewart (1914–1967), Scottish researcher in aerospace physiology
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