The 1919 Plymouth Sutton by-election was a parliamentary by-election held on 28 November 1919 for the British House of Commons constituency of Sutton in the city of Plymouth, Devon.
The seat had become vacant when the constituency's Conservative Member of Parliament (MP), Waldorf Astor, succeeded the peerage as the second Viscount Astor on the death of his father on 18 October 1919.
Astor had held the seat since the 1918 general election, and its predecessor Plymouth since the December 1910 general election.
Result.
Lady Astor retained the seat. She became the first woman to take up her seat in the Commons when the first woman to be elected, Countess Markievicz, (the Sinn Féin MP for Dublin St Patrick's) refused to take her seat).