Oleg Alexandrovich Maskayev (o-LEG mas-KA-yev, Russian: ???? ????????????? ???????; also Maskaev; born 2 March 1969) is a Russian-American former professional boxer who competed from 1995 to 2013, and held the WBC heavyweight title from 2006 to 2008.
He is one a few professional boxers to resume his amateur career after a professional debut in 1993.