John McQueen Johnston FRSE CBE FRCPE FRCSE LLD (1901–1987) was a Scottish physician and pharmacologist.
He was born in Falkirk in central Scotland on 26 December 1901, the son of a local schoolmaster.
He studied medicine at Glasgow University graduating MB ChB in 1923.
His proposers were Ralph Stockman, Thomas Nicol, John Walton and Sir Edward Battersby Bailey.
Johnston died in Edinburgh on 28 July 1987 but is buried near his early home, in Dalarossie churchyard in Inverness-shire in northern Scotland.