The Big Reunion is a British reality-documentary series that began airing on ITV2 on 31 January 2013. The show featured chart-topping bands who were big in the UK pop music scene between the 1990s and early 2000s, and the programme followed them as they reunited for the first time in a decade and went through their two weeks of intensive rehearsals before finally stepping back on stage for a comeback performance.

The first series featured Five, 911, Atomic Kitten, B*Witched, Blue, Honeyz and Liberty X. Another mini-series, entitled The Big Reunion: On Tour, aired from 5–19 September 2013. It followed the groups embarking on their arena tour, and other behind-the-scenes action. The Big Christmas Reunion, a Christmas special, also aired on 12 December 2013. It saw the bands recording a Christmas charity single for Text Santa and looked at how Text Santa helped vulnerable people.

The Big Reunion proved to be an unexpected hit for ITV2; the first episode brought in 1.2 million viewers, becoming the channel's highest-rated premiere in five years, and the show went on to achieve over 1 million viewers every week, making it one of the channel's most popular shows. Due to the huge success, a second series was commissioned. The second series, which premiered on 6 February 2014, featured 3T, A1, Damage, Eternal, Girl Thing, and a supergroup called 5th Story, which consisted of Kenzie from Blazin' Squad, Dane Bowers from Another Level, and former soloists Adam Rickitt, Kavana and Gareth Gates.