Heath "The Texas Crazy Horse" Herring (born March 2, 1978 in Waco, Texas) is an American Heavyweight professional mixed martial artist who attained popularity fighting for PRIDE FC in Japan and now fights in the Ultimate Fighting Championship. He is known for his entertaining battles with Antonio Rodrigo Nogueira, all three of which he has lost.

Herring was long suspected to be an acquisition of the UFC's purchase of the World Fighting Alliance. Herring had signed a contract with the WFA in 2006, and it was soon confirmed that he had become integrated into the UFC roster following the WFA buyout. He lost to Jake O'Brien via unanimous decision at UFC Fight Night 8 in his UFC debut.

On Saturday, April 7, 2007, at UFC 69 Heath faced off against The Ultimate Fighter 2 heavyweight finalist Brad Imes. Herring won the match by unanimous decision after 3 rounds.

At UFC 73, Herring lost via unanimous decision to Antonio Rodrigo Nogueira, but not before he landed a left high kick to Nogueira's head late in the first round. Nogueira was sent to the ground, visibly stunned, but Herring did not engage him and attempt to finish the fight, opting to stand up shortly after the kick and beckoned Nogueira to stand as well. The referee motioned Noguiera to stand up after the brief flurry on the ground, giving Herring the advantage but Herring was not able to finish the fight in the first round. Nogueira then controlled the action for the next two rounds with Herring backing away constantly.

At UFC 82 Heath put on what many believe was his best performance to date in the octagon, winning a three round split-decision against rising contender Cheick Kongo, the fight surprised many by taking place mostly on the ground while both are considered strikers they both showed vastly improving ground game. After the fight Heath said he wasn't happy with the fight, he wanted to give the fans a stand-up fight and Kongo refused to stand with him. Herring also said after the fight that he did not even train at all for the ground game.

Herring fought Brock Lesnar at UFC 87 after Mark Coleman was forced to withdraw due to a knee injury. The fight went the full 3 rounds and Lesnar was declared winner by unanimous decision. Herring was seen struggling with the larger, physically more dominant opponent, and was knocked down early in the first round with a straight right. According to Heath Herring's official Facebook profile in a note titled "6 Months To Rest", Herring is said to have suffered a broken orbital bone from the first punch of the fight and is expected to be out of action for six months.