John Sinclair

John Sinclair may refer to:

• Sir John Sinclair, 1st Baronet (1754–1835), politician and writer on agriculture and finance
• John Sinclair (Australian politician) (1807–1890), MLA for North Melbourne
• John Mitchell Sinclair (1819–1890), South Australian politician
• Sir John Sinclair, 3rd Baronet (1825–1912), Scottish politician and landowner
• John Sinclair (mayor) (1827–1906), mayor of Brisbane
• John Sinclair (Ayr Burghs MP) (1842–1892), Liberal MP for Ayr Burghs
• John Howard Sinclair (1848–1924), Canadian politician
• John Sinclair (New Zealand politician) (1850–1940), member of the New Zealand Legislative Council
• John Sinclair, 1st Baron Pentland (1860–1925), Scottish politician
• John Ewen Sinclair (1879–1949), Canadian politician
• John William Sinclair (1879–?), politician in Ontario, Canada
• John Sinclair, 3rd Viscount Thurso (born 1953), British Member of Parliament for Caithness and Sutherland

• John Sinclair (poet) (born 1941), American poet and political activist
• John Sinclair (musician) (born 1953), musician, played with Ozzy Osbourne and Uriah Heep
• Yasus Afari (born 1962), Jamaican dub poet, born John Sinclair
• Johnny Sinclair, musician in the bands The Pursuit of Happiness and Universal Honey
• "John Sinclair", a song by John Lennon on the Some Time in New York City album

• John Sinklo, sometimes known as John Sinclair, English renaissance actor
• John West Sinclair (1900–1945), American silent-screen actor
• John Gordon Sinclair (born 1962), Scottish actor

• John Sinclair (bishop) (died 1566), Ordinary Lord and later Lord President in the Court of Session
• John Sinclair, Lord Murkle (died 1755), Scottish judge
• John Sinclair, 11th Earl of Caithness (died 1789), Scottish noble
• John Sinclair (Archdeacon of Middlesex) (1797–1875), Scottish Archdeacon of Middlesex
• John Sinclair (interpreter), Canadian clergyman and interpreter among the Cree in the 19th century
• John Sinclair (New Zealand) (1843–1925), New Zealand carpenter, builder, station manager and harbourmaster
• John Sinclair (priest) (1853–1919), British clergyman, Archdeacon of Cirencester
• John Sinclair (physician) (1868–1940), British physician, Chief Medical Officer to the General Post Office
• John Houston Sinclair (1871–1961), British civil servant in Zanzibar
• Sir John Alexander Sinclair (1897–1977), British Army general, head of the Secret Intelligence Service
• John Sinclair (Lord Lieutenant of Caithness) (1898–1979), Scottish Lord Lieutenant
• John McHardy Sinclair (1933–2007), British linguist
• John Henderson Sinclair (1935–2009), British scholar and academic
• John Sinclair (environmentalist) (1939–2019), Australian environmentalist
• Jackie Sinclair (1943–2010), Scottish footballer
• John Sinclair (footballer) (born 1948), Australian rules footballer for Essendon
• John Sinclair (German fiction), fictional protagonist of a popular German "penny dreadful"
• John Sinclair (sociologist) (born 1944)