"Somebody Else" is a song by English band the 1975 from their second studio album, I Like It When You Sleep, for You Are So Beautiful Yet So Unaware of It (2016). The song was written by George Daniel, Matthew Healy, Adam Hann and Ross MacDonald. Mike Crossey handled the production alongside Daniel and Healy. The song was the last one written for the album; Healy developed the song's lyrics in Los Angeles while in the back of a cab. The singer focused on the after-effects of a breakup, centred on the themes of jealousy and guilt. It was released on 16 February 2016 by Dirty Hit and Polydor Records as the fourth single from the album.