Robert Allen Wiethoff (born September 15, 1976) is an American actor and voice actor. He is 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. Born and raised in Seymour, Indiana, Wiethoff attended Seymour High School, and graduated from Indiana University Bloomington in 1999. Soon afterwards, he moved to Los Angeles to pursue acting, but faced difficulty in finding roles, other than small parts in films and television advertisements. 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. For his role, he won Outstanding Character Performance at the 14th Annual Interactive Achievement Awards.

Following the release of Red Dead Redemption, Wiethoff moved back to Seymour to focus on his family, marrying his wife Tayler, with whom he has two children. He briefly returned to acting in New York City for Undead Nightmare, the downloadable content pack for Red Dead Redemption, but remained in Seymour afterwards to work in construction, allowing him to spend time with his family. In 2014, Wiethoff returned to portray John Marston in Red Dead Redemption 2, a prequel to the original game. Though he was told that he would be required for about a year, 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.

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