| Roles | Competed in Olympic Games |
|---|---|
| Sex | Male |
| Full name | Joseph Maria Leo•Callens |
| Used name | Joseph•Callens |
| Born | 22 February 1904 in Antwerpen (Antwerp), Antwerpen (BEL) |
| Died | 8 April 1979 in Antwerpen (Antwerp), Antwerpen (BEL) |
| Affiliations | CNA, Antwerpen (BEL) |
| NOC | Belgium |
Joseph Callens was Belgian champion in 200 m freestyle in 1924.
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1920 Summer Olympics | Diving (Aquatics) | BEL |
Joseph Callens | |||
| Springboard, Men (Olympic) | 6 p1 r1/2 | |||||
| 1924 Summer Olympics | Swimming (Aquatics) | BEL |
Joseph Callens | |||
| 4 × 200 metres Freestyle Relay, Men (Olympic) | Belgium | 3 h4 r1/3 |
Date of birth previously incorrectly listed as 20 March 1894.