Jason Zumwalt is a voice actor in Mafia II.

He is an American actor and scriptwriter, best known for his role as Roman Bellic in the video game Grand Theft Auto IV. Zumwalt began his acting career in 2004, playing a small role in the short film 16w. From then until 2008, he took small roles in low-budget films, television series and video game roles to make a living.

In 2008, Zumwalt was hired by Rockstar Games as a voice actor in their video game Grand Theft Auto IV, playing the role of protagonist Niko Bellic's cousin Roman. Upon release, Zumwalt's character was critically well-received due to his distinctive accent and humorous dialogue. To this day, Grand Theft Auto IV is still his most notable role.

In 2014 Zumwalt co-wrote the script for the dramatic thriller Urge, alongside Aaron Kaufman. He also co-wrote the screenplay for the 2015 independent film Flock of Dudes, alongside Bob Castrone and Brian Levin.