Union J (formerly Triple J) are a four-piece boy band from United Kingdom. They are contestants on The X-Factor (UK).

The band auditioned as a trio, consisting of band members Josh Cuthbert, Jaymi Hensley and JJ Hamblett, hence the "J" at the end of their name. Initially, they did not make it through the bootcamp stage. However, after fellow contestants Rough Copy had to withdraw from the show, they were given a second chance, and advanced to judges' houses, under the new alias Union J, with a new fourth member, George Shelley, who originally applied as a solo artist.

Read more about Union J on Last.fm.