| Marco Diener | |
| Nationality: | French |
| Sport: | Water polo |
| Birth Date: | 29 May 1913 |
| Birth Place: | Colmar, France |
| Death Place: | Passage d'Agen, France |
Marco Diener (29 May 1913 - 18 June 1965) was a French water polo player. He competed in the men's tournament at the 1948 Summer Olympics.[1]