Paschal Mooney, an unsuccessful Fianna Fáil candidate in the European elections last year, has been re-elected to the Seanad.
Mr Mooney was elected on the first count of a vote in a byelection caused by the death of Senator Peter Callanan last October.
A total of 206 TDs and Senators voted.
He will sit on the agricultural panel.
Mr Mooney, from Co Leitrim, was a senator for 20 years before narrowly losing his seat in 2007.
A journalist and broadcaster, he contested the European elections in the Ireland North West constituency in June.
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He received the unanimous nomination of the Fianna Fáil parliamentary party to stand in today’s byelection at Leinster House, according to the party’s press office.