It was established by the
Electoral (Amendment) (Dáil Constituencies) Act 2013 and first used at the
2016 election. It largely replaced the old constituency of
Dublin South, with the
electoral divisions in
Dún Laoghaire–Rathdown of Cabinteely-Loughlinstown, Foxrock-Carrickmines, Foxrock-Torquay and Stillorgan-Leopardstown being transferred to the
Dún Laoghaire constituency; and the electoral divisions in
South Dublin of Ballyboden, Edmondstown, Firhouse-Ballycullen, Firhouse-Knocklyon, Rathfarnham-Ballyroan, Rathfarnham-Butterfield, Rathfarnham-Hermitage, Rathfarnham-St. Enda's, Rathfarnham Village being transferred to
Dublin South-West. There was a minor boundary revision at the
2020 general election. The Constituency Review Report 2023 of the
Electoral Commission recommended that at the
next general election Dublin Rathdown be increased to a four-seat constituency with the transfer of territory from Dún Laoghaire. The
Electoral (Amendment) Act 2023 defines the constituency as: ==TDs==