| Roles | Competed in Olympic Games |
|---|---|
| Sex | Male |
| Full name | Oscar Joseph Stanislas•Grégoire, Jr. |
| Used name | Oscar•Grégoire |
| Other names | Оскар Иосиф Станислав Грегуар |
| Born | 26 March 1887 in Ivanteyevka, Moskva Oblast (RUS) |
| Died | 28 September 1947 (aged 60 years 6 months 2 days) in Bruxelles (Brussels), Région de Bruxelles-Capitale (BEL) |
| Affiliations | Royal Brussels SC, Bruxelles (BEL) |
| NOC | Belgium |
| Medals | OG |
| Gold | 0 |
| Silver | 2 |
| Bronze | 1 |
| Total | 3 |
With two silver medals, and one bronze, at pre-World War I Olympics, Oscar Grégoire was one of the outstanding representatives of the golden era of Belgian water polo in the early 20th century. Grégoire also won multiple Belgian championships with the Brussels SC team. At the 1908 and 1912 Olympics, Grégoire also represented Belgium in 100 metres backstroke but did not survive the heats in either year.
His father, also named Oscar Grégoire, was one of the founders of Royal Brussels SC in 1897. Five years later, as president of the club, he was instrumental in founding the Belgian Swimming Federation. Grégoire Sr. acted as the federation’s first president, until 1906.
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1900 Summer Olympics | Water Polo (Aquatics) | BEL |
Oscar Grégoire | |||
| Water Polo, Men (Olympic) | Brussels Swimming and Water Polo Club | 2 | Silver | |||
| 1908 Summer Olympics | Swimming (Aquatics) | BEL |
Oscar Grégoire | |||
| 100 metres Backstroke, Men (Olympic) | AC h6 r1/3 | |||||
| Water Polo (Aquatics) | BEL |
Oscar Grégoire | ||||
| Water Polo, Men (Olympic) | Belgium | 2 | Silver | |||
| 1912 Summer Olympics | Swimming (Aquatics) | BEL |
Oscar Grégoire | |||
| 100 metres Backstroke, Men (Olympic) | AC h3 r1/3 | |||||
| Water Polo (Aquatics) | BEL |
Oscar Grégoire | ||||
| Water Polo, Men (Olympic) | Belgium | 3 | Bronze |
Birth year previously misstated as 1877.