The 1940 Glasgow Pollok by-election was held on 30 April 1940 in the Glasgow Pollok constituency of the Parliament of the United Kingdom. The by-election was caused by the death of the previous MP, Sir John Gilmour.
As with other by-elections in the war period, the incumbent party was given a clear run by the other major parties.
It was won by Thomas Galbraith of the Unionist Party (Scotland). His only opponent came from a local Labour party -
which had been disaffiliated by the party's National Executive Committee for breaking the electoral truce - and stood as an Independent Labour candidate.
! scope="col" colspan="2" style="width: 130px"|Party
! scope="col" style="width: 17em"|Candidate
! scope="col" style="width: 5em"|Votes
! scope="col" style="width: 3.5em"|%
! scope="col" style="width: 3.5em"| ;templatestyles src="Template:Tooltip/styles.css" / ;±%
! colspan="3" style="text-align: right; margin-right: 0.5em" | Majority
! colspan="3" style="text-align: right; margin-right: 0.5em" scope=row | Turnout
! style="text-align:right;" | Swing
References.
 ;templatestyles src="Reflist/styles.css" / ;