Thiago de Lima Santos is a Brazilian professional mixed martial artist. He currently competes in the Light Heavyweight division in the Professional Fighters League (PFL). Prior to signing with the PFL, Santos competed in the Ultimate Fighting Championship (UFC) in the Light Heavyweight and Middleweight divisions, and he challenged for the UFC Light Heavyweight Championship once in July 2019. A professional competitor since 2010, he gained entrance into the UFC by competing on The Ultimate Fighter: Brazil 2. Santos runs a non-profit organization that offers free mixed martial arts training for children coming from poor families.