James Joseph "Jim" Norton, Jr. is an American comedian, radio personality, author, and actor. He is an on-air personality, often dubbed the "third mic" on The Opie & Anthony Show, which airs on Sirius XM Radio. Norton has appeared on The Tonight Show with Jay Leno, the Late Show with David Letterman, and Jimmy Kimmel Live. He has filmed a HBO stand-up special for the series One Night Stand as well as his special "Monster Rain", co-starred in the short-lived HBO sitcom Lucky Louie, and had cameos in the films Spider-Man, Zack and Miri Make a Porno, and Courting Condi.
Norton hosted a four-episode stand-up showcase for HBO titled Down and Dirty with Jim Norton and appeared on The Comedy Central Roast of Bob Saget. He was also in Jerry Seinfeld's 2002 documentary Comedian. Norton was a regular guest on The Tonight Show with Jay Leno.