Larn is a roguelike computer game written by Noah Morgan in 1986 for the UNIX operating system. Morgan's original version of Larn remains part of the NetBSD games collection. Larn is one of the shorter roguelike games. It can take many hours and tens (or even hundreds) of thousands of game turns to beat other roguelikes, such as NetHack or Ancient Domains of Mystery, but Larn can reasonably be completed in one play session.