Phil Hogan Fine Gael Bobby Aylward Fianna Fáil A by-election was held in the Dáil Éireann Carlow–Kilkenny constituency in Ireland on Friday, 22 May 2015, to fill the vacancy left by the resignation of Fine Gael Teachta Dála (TD) Phil Hogan on his appointment as European Commissioner.

It was held on the same day as national referendums on marriage equality and the age of eligibility for election to the office of president.

[1] The Electoral (Amendment) Act 2011 stipulates that a by-election in Ireland must be held within six months of a vacancy occurring.

Patrick McKee, who stood for Renua, had been elected to Kilkenny County Council for Fianna Fáil.

[5] Former TD Bobby Aylward of Fianna Fáil won the by-election on the 9th count, having received 27.8% of the first-preference votes.