William Stuart may refer to:

• Lord William Stuart (1778–1814), naval commander, MP for Cardiff (1802–14); nephew of William Stuart (1755–1822)
• William Stuart (1798–1874), Tory MP for Armagh City 1820–1826, Bedfordshire (1830–31; 1832–35); son of William Stuart (1755–1822)
• William Stuart (1824–1896), British diplomat, Minister to Argentina, Greece, and The Netherlands
• William Stuart (1825–1893), Conservative MP for Bedford (1854–57 and 1859–68); son of William Stuart (1798–1874)
• William Horwood Stuart (1857–1906), British diplomat and vice-consul; assassinated in Batum, Georgia
• William Z. Stuart (1811–1876), Justice of the Indiana Supreme Court

• Bill Stuart (1873–1928), American Major League Baseball player
• Hod Stuart (William Hodgson Stuart, 1879–1907), Canadian ice hockey player
• Billy Stuart (William Roxborough Stuart, 1900–1978), Canadian ice hockey player
• William Stuart (cricketer) (1871–1956), Australian cricketer
• William Stuart (footballer) (1890–?), English footballer
• Bill Stuart (rugby league), New Zealand rugby league player

• William Stuart (bishop) (1755–1822), Bishop of St David's in Wales and later Archbishop of Armagh in Ireland
• William Stuart (British Army officer) (1778–1837), British Army officer, Lieutenant Colonel of the Guards wounded at Waterloo
• William James Stuart (British Army officer) (1831-1914), British Army officer, Colonel Commandant of the Royal Engineers
• William Corwin Stuart (1920–2010), American federal judge
• William James Stuart (1873–1958), Scottish surgeon

• William Stewart (disambiguation)
• William Steuart (disambiguation)