Marcelo Fabián Domínguez (born January 15, 1970) is an Argentine professional boxer. A world champion and four-time world title challenger at cruiserweight, he held the WBC world cruiserweight title from 1996 until 1998. He originally won the interim WBC belt in 1995, having been promoted after his second defense of the belt that same year.

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Domínguez turned pro in 1991 and was able to land a title shot in only his sixteenth fight, against Anaclet Wamba in 1994 for the WBC cruiserweight title. Wamba won a majority decision. Domínguez was able to capture the interim WBC belt the following year though with a TKO win over Akim Tafer. He was able to defend the belt five times, being promoted to full champ along the way, before losing the belt to Juan Carlos Gómez in 1998 via decision. Domínguez rematched Gómez in 1999, and again came up short in a decision. In 2001, he was able to land a shot at WBO cruiserweight title holder Johnny Nelson, but lost a decision.

Domínguez later moved up to heavyweight and after drifting into obscurity for several years and fighting for fringe titles, Domínguez lined up a shot for the WBO interim cruiserweight title against Enzo Maccarinelli, but was TKO'd.^[1]

Dominguez retired after 2006, but returned in 2013.