"Up" is a song by British-Irish recording girl group The Saturdays from their debut studio album, Chasing Lights (2008). It was co-written by the track's producers, Josef Larossi and Andreas Romdhane of Quiz & Larossi, in collaboration with Ina Wroldsen. "Up" was first released by Fascination and Polydor Records on 12 October 2008 as the second single from Chasing Lights. It was accompanied by a B-side entitled "Crashing Down"; originally recorded by the Nolans in 1982, and written by Benjamin Findon, Robert Puzey and Mike Myers, and produced by Jewels & Store. The Saturdays previously collaborated with Ina Wroldsen for their debut single "If This Is Love", as well as on six other tracks chosen for the album. The song is upbeat and, has prominent pop and electropop genre characteristics. It contains lyrical influences from feelings of feminism and self-confidence in a personal relationship with your lover.

"Up" received mainly positive reviews from contemporary music critics. On 19 October 2008 it debuted at number five on the UK Singles Chart with sales of 26,593 in its first week of release. It became the group's second consecutive top ten hit in the United Kingdom and was certified Silver by the British Phonographic Industry. It was The Saturdays' best-selling single at that time, with sales of over 311,000 copies in the United Kingdom alone. The single became the group's first chart hit in Ireland where it peaked at number eleven, it also reached number 15 on the European Hot 100 Singles chart.

"Up" was accompanied by a music video that was directed by Harvey B. Brown and released on 2 September 2008. The video features the group performing dance routines in their signature-coloured dress code and jumping from large pillars. The Saturdays performed the song as part of their setlist for their tour, The Work Tour. It was also performed by the group on various television programmes, including: Kids Choice Awards, Sound and Everybody Loves Lil' Chris.

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