John Sinclair may refer to:
Arts and entertainment John Sinklo, (a.k.a. John Sinclair, fl. 1592–1604) English actor John West Sinclair (1900–1945), American actor John Sinclair (poet) (1941–2024), American poet and activist John Sinclair (musician) (born 1952), British keyboardist John Gordon Sinclair (born 1962), Scottish actor Yasus Afari (John Sinclair, born 1962), Jamaican poet John Sinclair (German fiction), German literary character
Law and politics Canada John Howard Sinclair (1848–1924), Canadian politician John Ewen Sinclair (1879–1949), Canadian politician John William Sinclair (1879–?), Canadian politician in Ontario
United Kingdom John Sinclair, Lord Murkle (died 1755), Scottish judge John Sinclair (Ayr Burghs MP) (1842–1892), British politician John Houston Sinclair (1871–1961), British civil servant in Zanzibar John Sinclair (Lord Lieutenant of Caithness) (1898–1979), Scottish Lord Lieutenant
Elsewhere
John Mitchell Sinclair (1819–1890), South Australian politician John Sinclair (mayor) (1827–1906), mayor of Brisbane John Sinclair (New Zealand politician) (1850–1940), member of the New Zealand Legislative Council John H. Sinclair (police officer) (born 1946), American law enforcement officer
Nobility John Sinclair, 3rd Earl of Caithness (died 1529), Scottish noble John Sinclair, Master of Caithness (died 1576), Scottish noble John Sinclair, 23rd Lord Herdmanston (1632–1666), Scottish noble John Sinclair, 10th Lord Sinclair (died 1676), Scottish noble John Sinclair, 8th Earl of Caithness (died 1705), Scottish noble Sir John Sinclair, 1st Baronet (1754–1835), Scottish politician and writer John Sinclair, 11th Earl of Caithness (died 1789), Scottish noble Sir John Sinclair, 3rd Baronet (1825–1912), Scottish politician and landowner John Sinclair, 1st Baron Pentland (1860–1925), Scottish politician John Sinclair, 3rd Viscount Thurso (born 1953), Scottish politician
Religion John Sinclair (bishop) (died 1566), Scottish Roman Catholic bishop John Sinclair (archdeacon of Middlesex) (1797–1875), Scottish Anglican archdeacon
John Sinclair (archdeacon of Cirencester) (1853–1919), British Anglican clergyman
Others John Sinclair (New Zealand carpenter) (1843–1925), New Zealand carpenter and harbourmaster John Sinclair (physician) (1868–1940), British physician John S. Sinclair (1897–1972), American lawyer and financier Sir John Sinclair (British Army officer) (1897–1977), British general John McHardy Sinclair (1933–2007), British linguist John Henderson Sinclair (1935–2009), British scholar and academic John Sinclair (environmentalist) (1939–2019), Australian environmentalist John Sinclair (sociologist) (born 1944), Australian sociologist John Sinclair (footballer) (born 1948), Australian rules footballer
Other uses "John Sinclair", song by English musician John Lennon
See also Jonathan Sinclair (disambiguation) Jack Sinclair (disambiguation) John St Clair (disambiguation)