| Roles | Competed in Olympic Games • Non-starter | |
|---|---|---|
| Sex | Male | |
| Full name | Marie Eugène "Marco"•Diener | |
| Used name | Marco•Diener | |
| Born | 29 May 1913 in Colmar, Haut-Rhin |  FRA |
| Died | 18 June 1965 (aged 52 years 20 days) in Le Passage-d'Agen, Lot-et-Garonne | FRA |
| Measurements | 182 cm / 80 kg | |
| Affiliations | SR Colmar — Colmar, Haut-Rhin | FRA |
| NOC | France | FRA |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1936 Summer Olympics | Swimming (Aquatics) | FRA |
Marco Diener | |||
| 4 × 200 metres Freestyle Relay, Men (Olympic) | France | |||||
| Water Polo (Aquatics) | FRA |
Marco Diener | ||||
| Water Polo, Men (Olympic) | France | |||||
| 1948 Summer Olympics | Water Polo (Aquatics) | FRA |
Marco Diener | |||
| Water Polo, Men (Olympic) | France | 6 |
