The Electoral (Amendment) Act 1980 (No. 17) was a law of Ireland which revised Dáil constituencies. It took effect on the dissolution of the 21st Dáil on 21 May 1981 and a general election for the 22nd Dáil on the revised constituencies took place on 11 June 1981. This Act repealed the Electoral (Amendment) Act 1974, which had defined constituencies since the 1977 general election. It delivered its report on 21 April 1980.