"Whole Again" is a song by British girl group Atomic Kitten for their debut studio album, Right Now (2000). It was co-written by Orchestral Manoeuvres in the Dark members and Atomic Kitten founders Andy McCluskey and Stuart Kershaw, along with Jem Godfrey and Bill Padley, with production helmed by McCluskey and Kershaw under their production moniker Engine. Godfrey and Padley are credited as additional producers.

It is the group's biggest selling single to date and was the final single to feature founding member Kerry Katona, who left the group midway through promoting the single. "Whole Again" was the first single released from the album in Europe and South Africa. It was a massive success, reaching number one in several countries and selling over a million copies in the UK alone.

The four writers were nominated for the Ivor Novello Award for excellence in songwriting, and Billboard ranked the track number 96 on their list of the "100 Greatest Girl Group Songs of All Time". Multiple artists, including OMD, have covered the song. Following the departure of Katona, she was replaced a few days later by Jenny Frost of fellow English girl group Precious, just after the single topped the UK Singles Chart. As a result, the music video was reshot and Frost's vocals appeared on the reissue of Right Now.