John Sinclair a name of several notable individuals

• John McHardy Sinclair (born 1933) a Professor of English Language at the University of Birmingham from 1965 - 2000 and founder of COBUILD, working in corpus linguistics.
• Sir John Sinclair was Head of the Secret Intelligence Service from 1953 – 1956.
• John Sinclair (born 1941) is a Detroit poet and radical.