"Dreamer" is a ballad and the third track from Ozzy Osbourne's album Down to Earth, which was released on October 16, 2001. The single peaked at number 10 on Billboard's Mainstream Rock Tracks. The song describes the rockstar's vision of people and humanity destroying Earth. In the liner notes to Osbourne's Prince of Darkness box set, Ozzy refers to this song as his version of John Lennon's "Imagine". The Japanese and European press of the single also include a slightly different version of the song, dubbed "Dreamer (acoustic)", and a previously unreleased song titled "Black Skies".

John Michael "Ozzy" Osbourne is an English musician and media personality. He rose to prominence during the 1970s as the lead singer of the heavy metal band Black Sabbath, during which period he adopted the nickname "Prince of Darkness".