Labour Councillor Carrie Smyth has been selected to run for the party in the Dun Laoghaire constituency in the upcoming general election.
She fended off a challenge by Senator Aideen Hayden, fellow councillor Deirdre Kingston, and party activist, David Traynor.
At the party selection convention, Cllr Smyth secured 39 votes, having already been widely tipped to win the nomination.
Senator Hayden won 31 votes, Ms Kingston garnered 21 votes, while Mr Traynor tallied with 20 votes.
The decision by former Labour Party leader, Eamon Gilmore, to step down from frontline politics means a new era for the party has begun in a constituency described as ''a political bear pit''.
The ex-Tanaiste, who attended last night's convention, was first elected to the Dail in the 1989 general election as a Workers' Party TD for the constituency.
Labour leader, Joan Burton, and deputy leader, Alan Kelly, were also in attendance.
An intense political battle is now looming in what will be one of the most fiercely fought Dublin constituencies.
Despite ongoing speculation he may not run again, the automatic re-election of Fine Gael's Sean Barrett, should he decide to keep his hat in the ring, effectively reduces the constituency to a three-seater.
Last month, Fine Gael TD, Mary Mitchell O'Connor, was selected to represent the party at its selection convention and a recent poll suggested she is likely to retain her seat.