"Ghost" is a song by Canadian singer Justin Bieber. It was sent to French contemporary hit radio on September 10, 2021, through Def Jam Recordings as the sixth single from his sixth studio album, Justice. Bieber wrote the song with Jon Bellion, Jordan K. Johnson, Stefan Johnson, and Michael Pollack. The track was produced by Bellion and the Monsters & Strangerz.
"Ghost" is an up-tempo pop rock ballad that meshes electronic dance music with drum and bass. It makes use of a folky acoustic guitar, busy programmed drums, and shimmering EDM synthesizers. The song's chattering beats give way to an acoustic guitar strum on the chorus. Lyrically, the song is about grief caused by the absence of a loved one, with Bieber singing: "I'll settle for the ghost of you / I miss you more than life." Fan speculation arose of the track being a reminiscence of a former love, specifically Bieber's ex-girlfriend, American singer Selena Gomez, but Bieber did not confirm who the song was addressed to.