Mark Kerr (born December 21, 1968 in Toledo, Ohio), also known as "The Titan," "The Specimen," and "The Smashing Machine," is an American mixed martial artist and champion collegiate wrestler.

Mark Kerr's first professional MMA fight was at the World Vale Tudo Championship III, where he won three fights, one by TKO by strikes (in which he broke his hand but continued to fight), another where the opponent literally crawled out of the ring to avoid Kerr's brutal ground-and-pound, and the final match was a savage half hour brawl (with his broken hand) in which he punched, kneed, head-butted and elbowed his way to victory. Kerr had four impressive wins in the UFC, in which he was a two time heavyweight tournament champion.

He then began fighting in PRIDE Fighting Championships in 1998. Kerr had a ground-and-pound fighting style where he would use takedowns to get his opponent onto the mat and then use strikes and submissions to try and finish the fight. Kerr's final MMA win was at PRIDE 10 where he defeated Igor Borisov by submission. Four months later, at PRIDE 12, he lost to Igor Vovchanchyn by decision, in the rematch of a PRIDE 7 fight where Kerr had been illegally knocked out by knees to the head from Vovchanchyn. Kerr would then lose to Heath Herring at PRIDE 15 via TKO.

This trend continued three years later in 2004 at his next match at PRIDE 27, where at just 40 seconds into the first round he knocked himself out while trying to drive Yoshisha Yamamoto into the ground during a double leg takedown (Mark hit the canvas with his own head and was out cold).