Thomas Sinclair may refer to:
Thomas Sinclair (politician, 1857–1940), Northern Irish Member of Parliament Thomas Sinclair (politician, 1838–1914), Ulster-Scots businessman and politician Thomas Sinclair Jr. (1841–1888), politician in Manitoba, Canada Tom Sinclair (born 1958), American athlete Tom Sinclair (footballer) (1880–1968), Scottish football goalkeeper Tommy Sinclair (footballer, born 1921) (born 1921), English footballer Tommy Sinclair (footballer, born 1897) (1897–1967), English footballer Tommy Sinclair (Scottish footballer), Scottish footballer Thomas Sinclair (writer), a contributor to the British Dictionary of National Biography Thomas Sinclair (died 1881), American businessman whose widow built the Brucemore mansion in Cedar Rapids, Iowa Thomas Sinclair, Australian actor in silent films such as The Kelly Gang (1920) Tom Sinclair, coxswain of Scottish lifeboat RNLB Emma Constance Thomas Sinclair, fictional character in the Killzone video games Albert Thomas Sinclair, American lawyer who corresponded with Archduke Joseph Karl of Austria about the Romani language
See also Thomas Sinclair Harrison (1898–?), South African World War I fighter ace Thomas Sinclair Holden (1906–1973), Australian politician and judge Sinclair Thomas (born 1968), British wheelchair basketball player and coach