Diego Esteban Simonet (born 26 December 1989) is an Argentine handball player for Montpellier and the Argentina national handball team.He defended Argentina at the 2011 World Men's Handball Championship in Sweden, 2012 London Summer Olympics, 2013 World Men's Handball Championship in Spain and 2015 World Men's Handball Championship in Qatar.
His action defending Argentina, brought home six continental championships (2000, 2002, 2004, 2010, 2012 and 2014).
Two of his brothers, Sebastian and Pablo, defended Argentina at Olympic and World Championship competitions.