David R. Marsh (born November 5, 1964) is an American video game designer known for his work supporting the intellectual properties that used to belong to ICOM Simulations, and creating the MacVenture game Shadowgate. As of 2012, he recently founded a new game development company called Zojoi, LLC with plans to release new, remastered and revised versions of games created by him and Karl Roelofs when they were at ICOM Simulations.