The Irish singer, 40, will co-host a new weekday breakfast show with Harriet Scott for Magic Radio in Britain.
"I can't wait to get started...," he says. "We'll make sure you get the perfect start to your day with plenty of laughs and all the songs you love."
Ronan joins an all-star line-up on the station, which also boasts singer Rick Astley, Kim Wilde and former Spice Girls star Melanie Chisholm among its regulars.
News of the Life is Rollercoaster singer's new gig comes just weeks after Keating revealed he and his Boyzone bandmates are quietly planning a get-together to celebrate their 25th anniversary.
The quartet is in top secret talks about a new album, tour, tell-all book and even a West End show.
Keating recently told The Sun, "It's such a long time and so much has happened. I'm sure we'll mark it in some way. But whether by tour, record, book, musical... we haven't decided yet."
The boys split in 2000 but reformed in 2008 for a world tour and hits album.
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