Din Yero Thomas (born September 28, 1976) is a retired American mixed martial artist who was featured on The Ultimate Fighter 4: The Comeback. In the Ultimate Fighting Championships, Thomas is a UFC 41 Lightweight Tournament Semifinalist. He holds a Black belt in Brazilian Jiu-Jitsu under Ricardo Liborio and currently runs two successful Brazilian Jiu-Jitsu and MMA academies in Port St. Lucie, Florida.