Rutherglen by-election, 1964

There was a by-election for the constituency of Rutherglen in the United Kingdom House of Commons in May 1964, not long before the 1964 general election.

It was a Labour gain from Conservative, the candidate was Gregor Mackenzie. Unlike some by-election gains it was held at the next general election and eventually became a fairly safe Labour seat, with Mackenzie as its MP until 1987.