"Whole Again" is the fifth single released from British pop girl group Atomic Kitten's debut album, Right Now (2000). 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, Australia, New Zealand and South Africa. It was a massive success, reaching number one in several countries, and sold 1 million copies in the UK alone. Among the song's writers was OMD frontman and Atomic Kitten founder Andy McCluskey, who achieved his only UK number one single with the track.

Following the departure of Katona, she was replaced a few days later by Jenny Frost, just after the single reached number one in the UK. As a result, the music video was reshot and Frost's vocals appeared on the reissue of Right Now.

Following the failures of previous single "Follow Me" and the initial release of their debut album, Right Now, Atomic Kitten persuaded Virgin Records to release the single as a last-ditch attempt to keep their record deal. They were given a shoe-string budget for the single's release with a basic video and previous photo shoots used for cover artwork. During promotion for the single, band member Kerry Katona announced her pregnancy and subsequent decision to leave the group. With the single's release imminent, the group opted to recruit Jenny Frost as a replacement and continued their promotional campaign. Surprisingly the single was a massive success, beating U2 to the number one spot on the UK Singles Chart and remaining there for four consecutive weeks.

.In a rare Asian pressing of their Right Now album, the song "Whole Again" features all lines spoken by Katona with only the chorus sung by the girls which was taken from the Japanese version of Right Now. The original version of Right Now features Katona's vocals; however, the reissue of the album features new vocals by Jenny Frost. This version has since replaced Katona's version for radio airplay, and it was subsequently issued as a bonus track on international versions of the group's second album, Feels So Good.

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