A Dungeon Master (DM), or Game Master (GM), is the planner, narrator, and referee of a tabletop role-playing game.  Matthew Mercer is the DM of the canonical Critical Role episodes and some of the special episodes. When Matt is unavailable or needs more time to plan for the next episode, one of the other players will sometimes take over as the DM for a one-shot game.

Liam O'Brien was the Dungeon Master for "Critical Role EXTRA – Liam's Quest!" (Sx12), "Critical Role Extra – The Return of Liam!" (Sx15), and "Liam's Quest: Full Circle" (Sx16).

Sam Riegel was the Dungeon Master for "Critical Role: Bar Room Blitz" (Sx21).

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