Leonard Boyarsky is an American game designer and one of the co-creators of the original Fallout game.

Boyarsky started his career in 1992 at Interplay, going on to work on Stonekeep, Fallout and its sequel Fallout 2. He co-founded Troika games in 1998 with Tim Cain and most notably lead the project Vampire: The Masquerade – Bloodlines.

In 2006 Boyarsky joined Blizzard to become lead world designer for Diablo III and its expansion, Reaper of Souls. In 2016, he joined Obsidian to rejoin long-time partner Tim Cain for The Outer Worlds.