Operation Transformation is a health and fitness programme airing on RTÉ One in Ireland. The show is a cross-media event broadcast via radio, web and television on RTÉ 2fm, RTÉ.ie and RTÉ One since 2008. Prior to this it had been limited to radio but has since expanded onto the web and television. It is comparable to US television show The Biggest Loser.

Kathryn Thomas is an Irish television presenter.