Bristol South East by-election, 1963

The Bristol South East by-election, 1963 was a by-election held on 20 August 1963 for the British House of Commons constituency of Bristol South East in the city of Bristol. The seat had become vacant in 1961 when the constituency's Labour Member of Parliament (MP) Tony Benn had inherited a hereditary peerage from his father, becoming Viscount Stansgate and ineligible to serve in the House of Commons. He had been elected at a by-election in 1950.

Benn stood in the 1961 by-election anyway, but due to his ineligibility, the Conservative Party candidate Malcolm St Clair was declared the winner. When the law was later changed to allow Benn to renounce his peerage, St Clair resigned his seat (by being appointed Crown Steward and Bailiff of the Manor of Northstead), triggering the 1963 by-election. Benn won again, with nearly 80% of the votes. The Conservatives did not nominate an official candidate, the last by-election in Great Britain in which there was no Conservative candidate until the Batley and Spen by-election in 2016, and the last by-election in Great Britain where the Conservatives did not field a candidate in a held seat until the Richmond Park by-election in 2016.

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