"You're My Best Friend" is a song by the British rock band Queen, written by bass guitarist John Deacon. It was originally included on the A Night at the Opera album in 1975, and later released as a single. In the US, "You're My Best Friend" went to number sixteen. The song also appeared on the Live Killers (1979) live album and on the compilation albums Greatest Hits (1981), Absolute Greatest (2009) and Queen Forever (2014).