Matías Sebastián Villavicencio (born 18 September 1981 in Buenos Aires) is an Argentine football defender who currently plays for San Martín Tucumán in the Torneo Argentino A.Villavicencio made his professional debut on 7 December 2001 in a 1-0 victory over Nueva Chicago. In 2002 he was part of the squad that won the Apertura 2002 championship.In 2004 Villavicencio joined Huracán of the 2nd division.