Template:By-elections to the 43rd UK Parliament

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1965	January: Leyton • Nuneaton • February: Altrincham and Sale • East Grinstead • Salisbury • March: Saffron Walden • Roxburgh, Selkirk and Peebles • April: Abertillery • May: Birmingham Hall Green • July: Hove • November: Cities of London and Westminster • Erith and Crayford

1966	January: Hull North

Lists of UK by-elections: 1885–1900 • 1900–1918 • 1918–1931 • 1931–1950 • 1950–1979 • 1979–present