| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Julio César•Costemalle | |
| Used name | Julio César•Costemalle | |
| Born | 3 May 1914 in Montevideo, Montevideo |  URU |
| Died | in ? (between 1961 and 1963) |  PAR |
| Affiliations | Biguá — Montevideo, Montevideo | URU |
| NOC | Uruguay | URU |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1936 Summer Olympics | Water Polo (Aquatics) | URU |
Julio César Costemalle | |||
| Water Polo, Men (Olympic) | Uruguay | =13 | ||||
| 1948 Summer Olympics | Water Polo (Aquatics) | URU |
Julio César Costemalle | |||
| Water Polo, Men (Olympic) | Uruguay | =13 |
