Mario Chiarini (born 7 January 1981) is an Italian baseball player who competed in the 2004 Summer Olympics.

Mario Chiarini was 16 years old in his senior debut, in 1997, for his hometown team Rimini Baseball.

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.

[3] He missed the 2016 edition because of an injury, to which manager Mazzieri said to be "strange to coach the team without him for the first time".