Jean-Marc Gilbert Mormeck (born 3 June 1972) is a French former professional boxer who competed from 1995 to 2014. He is a two-time cruiserweight world champion, having held the WBA title twice, from 2002 to 2007; the WBC and Ring magazine titles twice, from 2005 to 2007; and the lineal title in 2007. Mormeck also challenged for the unified world heavyweight title in 2012.
Mormeck was born in Pointe-à-Pitre, Guadeloupe as an only child to Fulbert and Sonia Mormeck. When he was 6, he and his family moved to Paris, France where he still lives. Mormeck engaged himself in football and Muay Thai as an amateur. After watching some boxing matches on television, he became inspired to excel in it.
He fought as an amateur in 1990 and turned professional in 1995. Early in his career, Mormeck lost 2 minor four-round bouts on points but kept winning for years afterwards. On 10 November 1998, Mormeck won the French light heavyweight title with a unanimous decision win over Alain Simon. He defended that title three times before relinquishing it.