Brian Posehn (born July 6, 1966 in Sacramento, California, USA (United States)) is an American actor and comedian, known for his roles as mail clerk Kevin Liotta on NBCs (NBC) Just Shoot Me!, a cast member and writer on HBOs Mr. Show, and currently as Brian Spukowski on Comedy Centrals (Comedy Central) The Sarah Silverman Program.

Movie appearances from Posehn include the 2003 comedy film sequel Dumb and Dumberer: When Harry Met Lloyd, Grind (Grind (2003 film)), the 2005 Rob Zombie horror film The Devils Rejects, Sleeping Dogs Lie, Fantastic Four: Rise of the Silver Surfer, and the 2007 animated feature Surfs Up (Surfs Up (film)), where he played Glen Maverick (List of Characters in Surfs Up#Glen Maverick). Posehn appeared as himself in the 2007 documentary Super High Me starring marijuana comedian Doug Benson, the 2008 documentary Nerdcore Rising (Nerdcore Rising (film)) about MC Frontalot and in a supporting role in Sarah Silverman: Jesus Is Magic.

Brian Posehn voices the character of Murray, a robot, in Rob Zombies animated The Haunted World of El Superbeasto. He also voiced the character Hayashi in the English dub of Pom Poko.