Marcel Gaston Charles Frébourg (2 March 1892 – 2 March 1950) was a French coxswain.
Frébourg competed at the 1906 Intercalated Games in Athens with the men's coxed four where they won silver.
In the men's coxed pair (1 km) he won a bronze medal.
In the 1 mile event for coxed pairs, he finished outside of the medals.
At the 1906 European Rowing Championships, he won a silver medal with the men's eight.