Rob Wiethoff is an American actor and voice actor best known for portraying John Marston in the 2010 video game Red Dead Redemption, its expansion Undead Nightmare, and the 2018 prequel Red Dead Redemption 2.
In 2008, Rockstar Games cast Wiethoff as John Marston, the lead character in Red Dead Redemption; he worked on the game for almost two years. He won Outstanding Character Performance at the 14th Annual Interactive Achievement Awards for his role. In 2014, Wiethoff returned to portray John Marston in Red Dead Redemption 2, a prequel to the original game. He ultimately worked on the game for almost four years, as his role was expanded to become a playable character like the first game; Red Dead Redemption 2 was released in 2018.