The Electoral (Amendment) Act, 1980 (No. 17/1980) was a law in Ireland which provided for parliamentary constituencies in the 22nd Dáil (1981–82), 23rd Dáil (February–November 1982) and the 24th Dáil (1982–87). The 22nd Dáil Éireann was elected at the 1981 general election on 11 June 1981, the 26th Dáil was elected at the February 1982 general election on 18 February 1982, and the 26th Dáil was elected at the November 1982 general election on 24 November 1982.
This Act replaced the Electoral (Amendment) Act 1974, which defined the constituencies used for the 21st Dáil (1977–81). It was itself replaced by the Electoral (Amendment) Act 1983, which created a new pattern of constituencies for the 25th Dáil (elected in 1987) and 26th Dáil (elected in 1989).