John Sinclair may refer to: Politicians 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 Music and poetry John Sinclair (poet) (born 1941), American poet and political activist John Sinclair (musician) (born 1952), British 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 Actors 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 Others John Sinclair, 3rd Earl of Caithness (died 1529), Scottish nobleman John Sinclair (bishop) (died 1566), Ordinary Lord and later Lord President in the Court of Session John Sinclair, Master of Caithness (died 1576), Scottish nobleman John Sinclair, 10th Lord Sinclair (died 1676), Scottish nobleman John Sinclair, 23rd Lord Herdmanston, Scottish noble John Sinclair, 8th Earl of Caithness (died 1705), Scottish nobleman 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 carpenter) (1843–1925), New Zealand carpenter, builder, station manager and harbourmaster John Sinclair (archdeacon of Cirencester) (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 Sinclair (British Army officer) (1897–1977), British Army general, head of the Secret Intelligence Service John S. Sinclair (1897–1972), American lawyer and financier John Sinclair (Lord Lieutenant of Caithness) (1898–1979), Scottish Lord Lieutenant John McHardy Sinclair (1933–2007),