"Goodnight Girl" is the third single from Scottish band Wet Wet Wet's fourth studio album, High on the Happy Side (1992). It was released on 23 December 1991 and was the second of the band's three UK number-one singles (the first being a cover of the Beatles' "With a Little Help from My Friends"), but the only one to be self-penned. Writer Graeme Clark was inspired to write the song for his then girlfriend, but has never publicly named her.