Mario Chiarini (born 7 January 1981) is an Italian baseball player who competed in the 2004 Summer Olympics. Chiarini played for the Arizona League Mariners in 2000, then he continued his career in Rimini Baseball, team of his hometown. With Rimini he won 3 Italian championships, and 2 national cups.
At the 2009 World Baseball Classic, Chiarini made a spectacular diving catch to rob Bobby Abreu of an RBI. In the process of doing so, Chiarini suffered an embarrassing wardrobe malfunction: Mario's belt split in half.
As a member of Italy national baseball team he won two European Baseball Championships, in 2010 and in 2012. He is actually the captain of the team.