Christopher Aguilar is Burmese Boy in The Chicken Roaster (Season 8 Episode 8).
Christopher Carroll is Maitre d' in The Watch (Season 4 - Episode 6).
Christopher Callins is Thug in 
Christopher Darga is the driver in The Lip Reader (Season 5 Episode 6).
Christopher Michael Moore is the Studio Guard in The Trip: Part 1 (Season 4 Episode 1).
Clint Howard is Tobias Lehigh Nagy, a.k.a. The Smog Stranglerin The Trip Part 2 (Season 4 Episode 2).
Clive Rosengren is Waiter in The Race (Season 6 Episode 10) and Mr. Clothworthy in The Switch (Season 6 Episode 11).
Colin Malone is Charlie, the Sleazy Guy in The Strike (Season 9 Episode 10).
Colin Malone is Charlie, the Sleazy Guy in 
Dan Frischman is Man on the Phone in The Mom and Pop Store (Season 6 Episode 8).
Dan Studney is Man fighting with Kramer over newspaper in The Subway (Season 3 - Episode 13).
Daniel von Bargen is Mr. Kruger in 4 episodes. The first: The Slicer (Season 9 Episode 7).
Daniel Zacapa is John Hanaran, The Power Guy in The Cadillac (Season 7 Episode 14).