Derrick Lewis (born February 7, 1985) is an American professional mixed martial artist. He currently competes in the Heavyweight division in the Ultimate Fighting Championship (UFC), where he currently holds the record for most knockouts in UFC history. A professional competitor since 2010, Lewis has also competed for Bellator MMA and Legacy FC, where he was the Heavyweight Champion. As of July 25, 2023, he is #10 in the UFC heavyweight rankings.