Matthew Christopher Miller who goes by the stage name Matthew Mercer, is an American voice actor.

For Disney, he voiced Tony Stark/Iron Man in Marvel Disk Wars: The Avengers, Captain America in Marvel Super Hero Adventures: Frost Fight, Wedge Antilles in Disney INFINITY: 3.0 Edition, additional voices in Monsters University, Foreteller Ira in the χ Back Cover cinematic cutscenes from the video game, Kingdom Hearts HD II.8 Final Chapter Prologue and Aleksei Sytsevich/Rhino in Marvel's Spider-Man.