"Miss You in a Heartbeat" is a 1993 song by British hard rock band Def Leppard from their album Retro Active. Three versions of the power ballad appear on Retro Active; the acoustic version (4:04), which was released as the single, the electric version (4:56), which was one of the bonus tracks for the Japanese pressing of Adrenalize along with "She's Too Tough", and the piano version which is featured as a hidden track on the Retro Active album. It is played after the electric version of "Two Steps Behind". The single peaked at number 39 on the US Billboard Hot 100 and was Def Leppard's last top 40 hit single. Although guitarist Phil Collen had written "Miss You in a Heartbeat", it was released first on the self-titled 1991 debut by The Law, a band featuring Paul Rodgers and The Who drummer Kenney Jones.