The Linger singer will take her place in the show's vacant spinning red chair alongside former Westlife star Kian Egan, Jamelia and Bressie when the new season of the show begins later this autumn (13).
Announcing the news on Friday (04Oct13), O'Riordan said, "It's great to be back in Ireland and to be taking part in one of Ireland's most popular Tv shows at same time. I know a good voice when I hear one and I am out to find the best star in the country."
The singer replaces The Corrs star Sharon Corr on the panel - she has stepped down as a judge on The Voice after two seasons to concentrate on her music career.
It was previously reported that R&B star Jamelia would also be departing the show after winning the most recent season with singer Keith Hanley, but she has opted to return.