Fine Gael Councillor James Geoghegan has secured the support of the 12 party branches in Dublin Bay South for the area's by-election.
Nominations close at midday on Monday 10 May.
400 local members will then select the Fine Gael candidate.
Councillor Geoghegan said: "I am thrilled to receive such broad support from right across the membership and the constituency.
"As the re-opening of our economy and society moves closer, our members, like every household across the country are focusing now on the future."
The postal ballot for the Fine Gael nomination will take place over two weeks and conclude with the count and declaration on 31 May.