Juan Domingo Roldán (6 March 1957 – 18 November 2020) was an Argentine professional boxer, best remembered for his strong showing in the early rounds of an undisputed world championship bout against Marvelous Marvin Hagler.

A final world middleweight title fight with Michael Nunn resulted in a loss by KO, following which Roldán ended his professional boxing career.

In his next fight, he beat José María Flores Burlón, a boxer who would later challenge Carlos De León for the world's Cruiserweight title.

Roldán won six more fights and drew one before challenging José Maria's brother, Carlos Flores Burlón for the South American Middleweight title, on February 12, 1982.

Before 1982 was over, he retained his Argentine Middleweight title with a first-round knockout of Marcos Perez, but losing on a disqualification in three rounds to Ricardo Arce.

In an immediate rematch, Roldán put his Argentine title on the line and this time, he avenged his defeat to Arce with a second-round knockout win.

After this win, Roldán was ranked number 1 by the major boxing organizations, and he accordingly met Hagler for the undisputed world middleweight title on March 30, 1984.

Roldán showed less recklessness than previously in this contest, and utilizing his innate hand speed and a style difficult for southpaws to defend against, he landed scoring punches for the next few rounds while pressing the action.