John Sinclair

John Sinclair may refer to:

• John Sinclair (d. 1566), Ordinary Lord and later Lord President in the Court of Session
• Sir John Sinclair, 1st Baronet (1754–1835), politician and writer on agriculture and finance
• Sir John Sinclair, 3rd Baronet (1825–1912), Scottish politician and landowner
• John Sinclair (MP) (1842–1892), Liberal MP for Ayr Burghs
• John Sinclair, 1st Baron Pentland (1860–1925), Scottish politician
• John Sinclair (environmentalist) (born 1939), Australian environmentalist
• John Sinclair (poet) (born 1941), American poet, activist and radio DJ, subject of John Lennon song
  • "John Sinclair" is a song by John Lennon on the Some Time in New York City album
• John Sinclair, 3rd Viscount Thurso (born 1953), often referred to as John Thurso, British Member of Parliament for Caithness and Sutherland
• Yasus Afari, born John Sinclair, 1962, Jamaican dub poet
• John Sinclair (German fiction), fictional protagonist of a popular German penny dreadful
• John Sinclair (musician), musician, played with Ozzy Osbourne and Uriah Heep
• John Sinclair (mayor), mayor of Brisbane
• John Alexander Sinclair (1897–1977), British spy
• John Ewen Sinclair (1879–1949), Canadian politician
• John Gordon Sinclair (born 1962), Scottish actor
• John Howard Sinclair (1848–1924), Canadian politician
• John McHardy Sinclair (1933–2007), Professor of English Language
• John West Sinclair (1900–1945), silent-screen actor

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