Diego Daniel Barreto Cáceres (born 16 July 1981) is a Paraguayan former professional footballer who played as a goalkeeper.

[1] Barreto started his career with the club Cerro Porteño, where he was trained by Modesto Sandoval and was teammates with Aldo Bobadilla.

The squad finished first, and then beat South Korea in the quarter-finals and Iraq in the semi-finals, before losing to Argentina in the final.

In 2007, Barreto had a spell with Newell's Old Boys in Argentina, but failed to break into the first team, returning to Paraguay in January 2008.

On 4 August, before the Summer Olympics began, he played in a preparation game against the Portugal of Cristiano Ronaldo in the city of Algarve, resulting in a 5–0 defeat.