| Jean Cosmat | |
| Birth Date: | 3 July 1910 |
| Birth Place: | Nantes, France |
| Death Place: | Nantes, France |
| Sport: | Rowing |
| Club: | CA Nantes |
Jean Georges Cosmat (3 July 1910 – 29 March 2010) was a French rower who competed in the 1936 Summer Olympics.
In 1936 he won the bronze medal as crew member of the French boat in the coxed four competition.[1]