The Laurence Olivier Award for Best Performance in a Supporting Role in a Musical was an annual award presented by the Society of London Theatre in recognition of achievements in commercial London theatre. The awards were established as the Society of West End Theatre Awards in 1976, and renamed in 1984 in honour of English actor and director Laurence Olivier.
On the 24 occasions that this commingled actor/actress award was given, it was presented 13 times to an actress, 10 times to an actor, and once to "The Chorus".