Kari Elizabeth Byron (5' 5½" (1.66 m) born December 18, 1974) is a San Francisco-based television host and artist, best known for her featured role on the Discovery Channel show MythBusters.
On MythBusters, Byron is a co-host and, with fellow co-hosts and "Build Team" members Tory Belleci and Grant Imahara, works with Adam Savage and Jamie Hyneman to test the plausibility of various myths. She and the others also host their own segments. She became involved in the show after persistently showing up at Hyneman's M5 Industries workshop in a desire to get hired by his company. On her first day as a paid employee, she was asked by Hyneman and MythBusters producer Peter Rees to help out with the "vacuum plane toilet" myth, and was asked to model her buttocks for a cast. She and the other Build Team members were given a more prominent role beginning with the show's second season. Not having had a long history in show business, Byron at first found it difficult to act naturally with this more visible position but gradually became more accustomed to it.