Nadine Elizabeth Louise Coyle (born June 15, 1985 in Derry City, County Derry, Northern Ireland) is a singer in the all-girl group Girls Aloud.

A native of Derry City, Nadine first found fame in 2001 when, while still at school, she entered the Irish version of the talent show Popstars. As one of the winners of the show, Nadine was selected to become a member of the band Six. Shortly after the band was formed, the bandmates moved into a house together and all were interviewed on camera. Nadine gave a string of information about herself, but then stopped suddenly and whispered "What date of birth did I give...?". She initially maintained that she had simply made a mistake when stating her birthday, but later broke down off camera and admitted that she had lied about her age, and was in fact only 16 years old. As the minimum age stipulated by the producers was 18, she had to be dropped from the band.