Kari Byron - photoshoot for FHM, 2007

Kari Elizabeth Byron (born December 18, 1974) is an American television host and artist, best known for her featured role on the Discovery Channel show MythBusters.

Byron was a cast member on MythBusters from Season 2 until 2014. Along with fellow cast members Tory Belleci and Grant Imahara they comprised what is commonly referred to as "The Build Team" or B Team. This Build Team worked with Adam Savage and Jamie Hyneman to test the plausibility of various myths throughout their tenure with the show. She and the others also hosted 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. 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.

During the second half of the 2009 season, Byron was on maternity leave and was temporarily replaced by Jessi Combs. Since 2010, Byron has her own show, Head Rush, on the Science Channel, geared towards science education and teens.

Byron has also hosted the 2010 and 2011 editions of Large, Dangerous Rocket Ships for the Science Channel. She and Belleci made a guest appearance on the October 3, 2012 episode of the Discovery series Sons of Guns. They test-fired some of the weapons in the Red Jacket shop and watched as the staff re-tested a myth previously busted by the Build Team: that a propane tank could explode if struck by a bullet. On August 21, 2014, it was announced that Byron, along with co-stars Grant Imahara and Tory Belleci, would be leaving MythBusters.