Osmay Acosta Méndez Duarte (born April 3, 1985) is a Cuban former amateur boxer, who competed between 2001 and 2010, best known to win the 2007 PanAm Games at Heavyweight with 201 lbs (91 kg) limit.

At the national senior championships ("Playa Girón") 2006 he was beaten inside the distance by Odlanier Solis in an attempt to compete at super heavyweight so he dropped down to 201 lbs where he won the 2006 Central American Games.

He won the 2007 PanAm games stopping local favourite Rafael Lima in the semifinals and easily beating Jose Julio Payares of Venezuela 11:3 (including a knockdown) in the finals.

Acosta was undefeated for more than a year then was upset at the 2008 Strandzha Cup by an unknown Scotsman Stevie Simmons and struggled at the National Championships.

At the 2009 World Amateur Boxing Championships he defeated John M'Bumba but lost the final to fellow southpaw Egor Mekhontsev and won silver.