Mr Kielty is known for his appearances on This Morning and his BAFTA-nominated documentary My Dad, The Peace Deal and Me.
Patrick Kielty will take over as host of The Late Late Show from next season, RTÉ has confirmed.
Mr Kielty, originally from Dundrum in Co Down, will be the fourth presenter of the late-night chat show for its 61st season next September.
He said he is “absolutely thrilled” to be the next host of The Late Late Show.
“To follow in the footsteps of Gay, Pat and Ryan as the next custodian is a real honour and I can’t thank RTÉ enough for giving me the chance,” he said.
“I’m also genuinely humbled to become part of Friday nights for so many Irish people, at home and around the world.”
Mr Kielty started his career as a stand-up comedian, having been a finalist in a National Comedy Search organised by The Late Late Show in 1992.
He has also appeared as a guest on Live at the Apollo and previously presented on ITV show This Morning.
His Bafta-nominated documentary My Dad, The Peace Deal and Me saw him named documentary host of the year at the 2018 Grierson Awards.
— RTÉ (@rte) May 20, 2023
RTÉ Director of Content Jim Jennings said Mr Kielty is “one of Ireland's finest comedians [and] a fantastic presenter with a depth of experience and a range of talents”.
“Patrick's personality and passion is sure to connect with audiences and I look forward to it bursting on to screens in September,” he said.
Mr Jennings said they have “definite ideas for the show already in the works.
“We’ll be busy behind the scenes shaping the series for launch.”
Mr Kielty takes over from Ryan Tubridy, who announced his departure from the show in March.
Next week will mark Mr Tubridy’s final appearance as host of The Late Late Show.