Tomas Díaz Mendoza, better known by his ring name Villano IV, is a Mexican professional wrestler. Within the stable Los Villanos, he has wrestled for Universal Wrestling Association (UWA), Asistencia Asesoría y Administración (AAA), and World Championship Wrestling (WCW). While popular and successful in Mexico, he frequently performed as a jobber in WCW. The other sons of Ray Mendoza who have used the name "Villano" include Villano I,Villano II, Villano III (Arturo Díaz Mendoza), and Villano V (Raymundo Diaz Mendoza).