Jorge Fernando "Locomotora" Castro (Spanish: locomotive) (born August 18, 1967) is an Argentine former professional boxer and former WBA middleweight champion of the world, who is best known for his second defense of the title against John David Jackson in 1994.

In December 1991, at Palais Omnisports, Bercy, France, Castro lost to Terry Norris by a wide unanimous decision in a challenge for the WBC super welterweight title.

In June 1992, at the Civic Center in Pensacola, Florida, United States, Castro lost a wide decision over ten rounds to future pound for pound king Roy Jones Jr. Castro became a world champion in 1994 by defeating Reggie Johnson in Buenos Aires by split decision to win the vacant WBA middleweight title.

After defeating Alex Ramos by a knockout in two rounds to retain the belt, he travelled to Monterrey, Mexico, to defend against the former undefeated holder of the WBA title John David Jackson in December 1994.

Jackson got up, but he suffered two more knockdowns and Castro completed what could be said that was one of the greatest turnarounds ever in a boxing fight, retaining the title by a knockout in the ninth round.