Steven Francis Cantwell (born August 12, 1986) is a retired American mixed martial artist. A professional competitor from 2005 until 2012, he competed for the UFC and for the UFC's sister organization, World Extreme Cagefighting. There, Cantwell was a one-time WEC Light Heavyweight Champion and he was the last man to hold the title before WEC's Light Heavyweight division was migrated into the UFC.