The Taoiseach Enda Kenny has announced Senator Jerry Buttimer as the leader of the Seanad.
It comes as the 25th Seanad meets for the first time today.
Mr Kenny was expected to give the nod to his deputy leader and former Minister, James Reilly.
The Taoiseach said: "I am pleased to appoint Senator Jerry Buttimer as Leader of the new Seanad which meets for the first time today.
"Jerry has gained considerable parliamentary experience as senator, Dáil deputy and as chairperson of the Joint Oireachtas Committee on Health.
"This experience makes Jerry very ably qualified for what will be a very important and challenging role in the new parliamentary environment. He will work closely with all other parties, groups and independent senators to ensure the effective and efficient functioning of the new Seanad."