Juan Carlos "J.C." Giménez Ferreyra (born 20 December 1960) is a Paraguayan boxer.

During his career he was WBC International light heavyweight champion and unsuccessfully fought for the World Super Middleweight title four times, first against Mauro Galvano in 1992, then against Chris Eubank the same year, against Nigel Benn in 1994 and finally against Joe Calzaghe in 1998, losing via doctor stopage.

During his career he went the distance with Nigel Benn, Chris Eubank and Roberto Durán.

He last fought in 2010, winning the Paraguayan Cruiserweight title against Nicasio Moray Martinez.

This biographical article related to a Paraguayan boxer is a stub.