Both the Longford/Westmeath and Dublin West byelections will take place on May the 23rd, the same day as the Local and European Election.
The seats are vacant following the death of Fine Gael's Nicky McFadden and the resignation of Independent Patrick Nulty.
The Tanaiste Eamon Gilmore told the Dail earlier that the Government had moved the writs to hold both of the byelections on the 23rd of May.