A live action role-playing game (LARP) is a form of role-playing game where the participants physically act out some or all of their characters' actions. The first LARPs were run in the late 1970s, inspired by role-playing games and genre fiction. The activity gained international popularity during the 1980s.

LARP groups have highly varied approaches to rules, costume, degree of physical acting out, focus of character activity, and genre. LARPs range in size from small private events lasting a few hours to huge public events with thousands of players lasting for several days.