Marc Grosjean (born 11 September 1958) is a Belgian football manager. He most recently managed Deinze in the Challenger Pro League.
Grosjean is a native of Liège, Belgium.
In 2015, Grosjean was appointed manager of Belgian side Royale Union Saint-Gilloise. Previously, he worked in Saudi Arabia. In 2022, he was appointed manager of Belgian side RRC Stockay Warfusée.
Grosjean has been a longtime friend of Belgian manager Emilio Ferrera.