"Sunday Girl" is a song recorded by the American new wave band Blondie, from the band's 1978 album Parallel Lines. Written by guitarist Chris Stein, the song was inspired by Debbie Harry's cat, who was named Sunday Man—the cat had recently run away, inspiring the song's "plaintive" nature.

Blondie is an American rock band formed in 1974 in New York City by singer Debbie Harry and guitarist Chris Stein. The band was a pioneer in the American new wave scene of the mid-1970s in New York City.