"X" is a single by English-Irish pop group Liberty X. It was released on 19 June 2006 as the third and final single from their third studio album X (2005). It was the written by band members Tony Lundon, Kelli Young, Jessica Taylor and Kevin Simm, alongside Johnny Douglas, and was the band's last single before the announcement of their split. and became their lowest charting single of their career, only peaking at number 47 on the UK Singles Chart. However, the song became a minor hit in South Africa, peaking at number 21 on the country's official airplay chart.

Following the release of Liberty X's Children in Need single, "A Night to Remember", it was announced that due to poor sales of their third album X, which sold just over 10,000 copies in the United Kingdom, that the band would extensively tour the album, in an attempt to promote the failing release. On 7 May 2006, the band were featured in the line up of Aberystwyth University May ball, alongside Chesney Hawkes and BodyRockers. However, their set was cut short when a smoke bomb was set off during the first two minutes, filling the room with smoke. Firefighters gave the all-clear after 50 minutes, but Liberty X failed to reappear. Students were told the band were not returning to finish their set, and this was met by jeers, as students had paid £37 for the evening.

The music video for "X" was filmed on a budget of just £4,750, as revealed by Taylor during The Big Reunion, which was a considerably smaller budget compared to some of the band's other videos, such as the £200,000 budget given to the "Got to Have Your Love" video. The band later revealed that they believed the poor outcome of the video contributed to the single's overall chart position.

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