The Hemsworth by-election, 1946 was a parliamentary by-election held in England for the British House of Commons constituency of Hemsworth on 22 February 1946. The seat had become vacant on the death of the Labour Member of Parliament George Griffiths, who had held the seat since a 1934 by-election. The Labour candidate, Horace Holmes, was returned unopposed. This was the last uncontested Parliamentary election to date outside Northern Ireland.