Dublin Bay South (Dáil constituency)

Dublin Bay South is a parliamentary constituency that has been represented in Dáil Éireann, the lower house of the Irish parliament or Oireachtas, since the 2016 general election. The constituency elects 4 deputies (Teachtaí Dála, commonly known as TDs) on the system of proportional representation by means of the single transferable vote (PR-STV).

History and boundaries
It was established by the Electoral (Amendment) (Dáil Constituencies) Act 2013. The constituency incorporates the entirety of the former Dublin South-East constituency with the addition of territory from Dublin South-Central, centred on Terenure and Harold's Cross. The constituency was named Dublin Bay South for "reasons of symmetry", with the new Dublin Bay North constituency.

The Electoral (Amendment) (Dáil Constituencies) Act 2017 defines the constituency as:

The Constituency Review Report 2023 of the Electoral Commission recommended that at the next general election Dublin Bay South be altered by the transfer of territory to Dublin South-Central.

For the next general election, the Electoral (Amendment) Act 2023 defines the constituency as:

Voting patterns
In 2021, Dublin Bay South was characterised as a "Fine Gael heartland" by some of the Irish national media, noting the area (as Dublin South-East) was once the seat of Fine Gael leaders John A. Costello and Garret FitzGerald and their historical performance in the area. However, it has also been the seat of party leaders Ruairi Quinn and Ivana Bacik of the Labour Party, Michael McDowell of the Progressive Democrats, and John Gormley and Eamon Ryan of the Green Party. Dublin Bay South has been called "one of the most liberal constituencies in the country" as well as "one of the wealthiest". As Dublin South-East, the area had the highest vote against the introduction of the Eighth Amendment in 1983, and in the 2018 referendum it had the highest vote in favour of repealing it. It has been noted that between the Labour Party, the Green Party, the Social Democrats and Democratic Left, centre-left parties have won at least 29% of the vote in every election in the area between 1981 and 2021.

The constituency has been marked by the consistently low-voter turnout, normally coming in at 54%; this can be partially attributed to the high rate of residential turnover in the areas of Rathmines and Ranelagh.

As of 2021, half of adults in the constituency have been described as professionals, 57% of individuals have third-level qualifications, and 44% live in privately rented apartments.

2021 by-election
A by-election took place on 8 July 2021, to fill the vacancy left by the resignation of Eoghan Murphy.