Timothy Lewis Matheson (born December 31, 1947, in Glendale, California) is an American actor. He was the original voice of Jonny Quest. His other voice roles for Hanna-Barbera included:
- Sinbad Jr. (uncredited role)
- Jace on Space Ghost & Dino Boy
- Samson on Young Samson
- 4-DAC in Jonny Quest vs. the Cyber Insects
From 1999 to 2006, Matheson played Vice President John Hoynes on the NBC drama The West Wing. He shares a birthday with actor Val Kilmer.
- Tim Matheson (I) at the Internet Movie Database