Sunday Girl is a song recorded by the British synthpop duo Erasure. Written by Erasure members Vince Clarke and Andy Bell, it is the opening track on the duo’s thirteenth studio album Light at the End of the World. The song was the second UK single released from the album, on 11 June 2007. A North American release followed in July 2007.

Sunday Girl is a very uptempo electronic music song which tells the story of someone who has immersed herself in nightlife and while in a nightclub catches the attention of Bell, who offers to dance with her “‘til Sunday morning” but warns “don’t you mess your life up, Sunday Girl”. The introduction is very similar to the bridge of the duo’s 1995 single Fingers & Thumbs (Cold Summer’s Day).

The single became Erasure’s thirty-fourth Top 40 single in the UK, but has the distinction of being their lowest charting (and the first to miss the Top 30) since Oh L'Amour, twenty-one years earlier.