"Beat Again" is the debut single by English boy band JLS. It was released on 12 July 2009 as the lead single from their self-titled debut studio album JLS (2009). The song was written by Wayne Hector and Steve Mac and produced by Mac. The song's B-side is a cover of "Umbrella" by Rihanna, which JLS covered during the semi-finals of the fifth series of The X Factor in December 2008.

The song debuted at number one on the UK Singles Chart. It also peaked at number three in the Republic of Ireland. It has sold over 560,000 copies in the United Kingdom as of August 2014, making it the band's best-selling song.

After finishing as runners-up to Alexandra Burke on the fifth series of The X Factor in December 2008, JLS signed a record deal with Epic Records. Epic managing director Nick Raphael said, "JLS are the best boy band to emerge from a TV talent show. The band already have an incredible fan base, and I look forward to launching their recording career."

"Beat Again" was unusual for being a debut single from reality show contestant in that was not a cover version, following in the footsteps of Girls Aloud, Shayne Ward and Leona Lewis. Instead, this song written especially for JLS by Wayne Hector and Steve Mac. The song was originally titled 'No Beat' and supposedly took only two hours to write. Mac himself had originally presented the song to Nick Raphael, JLS' A&R at Epic Records, as a potential single. "Beat Again" is written in the key of A-flat minor. Raphael had originally been looking for a ballad in the vein of Boyz II Men's "End of the Road" and had in fact already asked Mac for another "Flying Without Wings". However, according to co-writer Wayne Hector, Raphael's response upon hearing the new song was, "this is the single. I can feel it. It's fantastic." Raphael had supposedly originally intended "Everybody in Love" to be the lead single but changed his mind at the last minute.

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