Infobox last updated on: May 18, 2009.

Agustín Calleri (born September 14, 1976 Río Cuarto) is a professional male tennis player from Argentina. He won his first title as a professional player in Acapulco in 2003 beating his countryman and friend Mariano Zabaleta. His nickname is Gordo that means Fat in Spanish. He is known as a hard-hitter and he prefers playing on clay.

In 1999 he picked up first ATP win over Jan Vacek at Roland Garros. Also advanced to first quarterfinal at Umag. In 2000 he made the third round in Roland Garros, before losing to Andrei Medvedev. He beat Marat Safin in Kitzbühel and pushed Pete Sampras to two tie-breakers in US Open's third round. Then in 2001 he won three challenger events beating Juan Ignacio Chela and David Nalbandian.