Mariano Esteban Uglessich ( born 6 November 1981 in Buenos Aires) is a retired Argentine footballer who played as a defender.

He played very briefly for the Mexican League System Segunda División de México Querétaro F.C.

He was part of the team that won the Torneo Clausura 2005 but he hardly ever played due to being overshadowed by Fabricio Fuentes, Maximiliano Pellegrino and Hernán Pellerano.

After the match, he played on 8 January 2010, he used his Twitter account to make racial slurs about the Brazilian Players of Santos.

He participated with the club in the 2014 Copa Libertadores where they faced Deportivo Cali, Cerro Porteño and Lanús, being third and being eliminated in the group stage.