"Stop Me If You Think You've Heard This One Before" is a song by the English rock band the Smiths, written by singer Morrissey and guitarist Johnny Marr. The song was first released on the group's 1987 album Strangeways, Here We Come. Marr's music features a larger sound, courtesy of a 12-string Gibson ES-335, and one of his few guitar solos with the Smiths. Morrissey's lyrics allude to alcohol and deception.

Although the song was originally planned to be released as a single in August 1987, the BBC objected to the song's lyrical reference to mass murder in the aftermath of the Hungerford massacre. As a result, "Stop Me If You Think You've Heard This One Before" was only released as a single in America, Australia, and some European markets, while "I Started Something I Couldn't Finish" was chosen to replace the song as the band's new UK single.

Despite its censorship by British radio, "Stop Me If You Think You've Heard This One Before" has seen critical acclaim for Marr's guitar work and Morrissey's witty lyricism. It has since appeared on multiple compilation albums and has been ranked by music writers as one of the band's best songs.