César Osvaldo Villaluz Martínez[a] (born 18 July 1988) is a former Mexican professional footballer who last played as a midfielder for Cancún.

His efforts as midfielder assisted the team to victory against Brazil, as well as throughout the entire tournament.

Fellow team players Carlos Vela and Giovani dos Santos, both of whom are younger than he, played with him in the 2007 FIFA U-20 World Cup that took place in Canada in 2007.

Villaluz is known for his quick rapid speed and great control while dribbling the ball.

César's first goal with the senior national team was in a friendly against Guatemala which resulted in a 3–2 loss for Mexico.