| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Jacob Arnold "Koos"•Maasdijk | |
| Used name | Koos•Maasdijk | |
| Born | 19 September 1968 in Rotterdam, Zuid-Holland |  NED |
| Measurements | 195 cm / 96 kg | |
| Affiliations | Skadi — Rotterdam, Zuid-Holland | NED |
| NOC | Netherlands | NED |
| Medals | OG |
| Gold | 1 |
| Silver | 0 |
| Bronze | 0 |
| Total | 1 |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1992 Summer Olympics | Rowing | NED |
Koos Maasdijk | |||
| Quadruple Sculls, Men (Olympic) | Netherlands | 5 | ||||
| 1996 Summer Olympics | Rowing | NED |
Koos Maasdijk | |||
| Eights, Men (Olympic) | Netherlands | 1 | Gold |
