"Untouchable" is the twenty first single by British pop group Girls Aloud, and the third single to be taken from their fifth studio album, Out Of Control. The song is to be released on 27 April 2009

The song is Girls Aloud's longest yet, at a full runtime of 6:45. Sarah Harding described the song as "so Nineties, a proper pop dance song. It’s got that trancy, chilled Ibiza feel.  I get lost in the music at the beginning and then it builds and builds and builds. You just want to go mental." "Untouchable" was selected as the third single from Out of Control after it fared best in a fan poll on Girls Aloud's official forum. It was announced as the single on 20 February 2009. The first performance of the song occured at the Dancing on Ice semi-finals. Girls Aloud entered on wires suspended from the ceiling (similar to the entrance from their Tangled Up Tour), and performed the song whilst ice dancers Torvill and Dean skated around them.

"Untouchable" received generally favourable reviews from critics. The song was referred to as "fast, electronic and fantastic" with an immense build-up to the chorus by Popjustice. It was praised by NME, described as "post-Ibiza power-balladeering". "Untouchable" was hailed as "one of the classiest and most ambitious pop songs of the year." However, MSN said "the plodding disco track falls short
 

The music video for "Untouchable" was directed by Marco Puig with post-production from The Mill. Shot in a west London studio on 18 March 2009, the filming took sixteen hours. Pictures of Girls Aloud in their "skimpy rubber" outfits for the music video were published in tabloid newspapers on 25 March 2009. The video premiered on 25 March 2009 on 4music at 7:00pm GMT and was shown again at 11:05pm on Channel 4. The "Untouchable" video was made available on MSN the following day.

The futuristic video was inspired by Stanley Kubrick's classic science fiction film 2001: A Space Odyssey. Girls Aloud appear in "sci-fi inspired PVC leotards", travelling through space and approaching Earth in illuminated glass spheres (resembling meteorites). After the second verse, the words 'Alert: Condition Red' appear on the screen and the girls have trouble in their bubble-like orbs. They begin to plummet through Earth's atmosphere, with the spheres erupting in flames. Still burning, they pass an aeroplane and approach a city. The video ends with televisions showing the 'breaking news' as they hit the ground, with a reporter describing it as a "meteor shower". The outcome of Girls Aloud is unknown, due to static waves breaking up the picture following the impact.

Digital Spy lauded the "Untouchable" music video as "almost as exciting as the song itself