# John Sinclair

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) (1941–2024), 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), 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)