| Marius Berthet | |
| Nationality: | French |
| Sport: | Rowing |
| Birth Date: | 29 December 1903 |
| Birth Place: | Saint-Ours, Savoie |
| Death Date: | 22 February 1987 |
| Death Place: | Aix-les-Bains |
Marius Berthet was a French rower. He competed in the men's eight event at the 1928 Summer Olympics.[1]
His brother Joseph Berthet was also an Olympic rower.