James Sinclair
James Sinclair may refer to:
- James Sinclair, 8th Lord Sinclair, Scottish nobleman
- James Sinclair, 12th Earl of Caithness, Scottish noble
- James Sinclair (fur trader), Canadian fur trapper
- James Sinclair, 14th Earl of Caithness, Scottish Liberal politician, scientist and inventor
- James H. Sinclair, U.S. Congressman from North Dakota
- Jimmy Sinclair (cricketer), South African cricketer
- Jim Sinclair (footballer), Australian rules footballer
- James Sinclair (politician), Canadian politician
- James Sinclair (botanist), Scottish botanist
- Jim Sinclair (politician), Canadian Non-Status Indian and Métis politician
- Jim Sinclair (activist), American autism rights activist
- Jimmy Sinclair (footballer, born 1957), Scottish football forward
- James Sinclair (conductor), American classical music conductor
- James Sinclair (footballer), English footballer
- Jimmy Sinclair (footballer, born 2006), English football left-back
- Jimmy Sinclair (rugby union), New Zealand medical doctor and international rugby union player
- James Sinclair, English co-founder of EnterpriseAlumni
- James Sinclair, British entrepreneur, founder of The Partyman Group
- Jim Sinclair, character in 1967 film ''Africa Texas Style''