Fine Gael's Paddy Burke has been elected, unopposed, as Cathoirleach of the 24th Seanad.
His nomination received cross-party support from Labour, Fianna Fáil and the Independents.
The outgoing Leas-Chathaoirleach could be the last person to fill the role as Senators are fighting for the survival of the second house.
The Taoiseach earlier told the Dáil that the Government intends to hold a referendum on the abolition of the Seanad next year.
Earlier, temporary Cathaoirleach Senator David Norris, warned his colleagues that they were "facing the possibility of extinction", while SF Senator David Cullinane argued that the Seanad, in its current guise, deserved to become extinct.
Senator Burke said he considered it a great honour to be named Cathaorleach.