| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Female | |
| Full name | Sieta•Posthumus | |
| Used name | Sieta•Posthumus | |
| Born | 22 April 1936 in Leeuwarden, Friesland |  NED |
| Died | 3 October 2013 (aged 77 years 5 months 11 days) | |
| Measurements | 161 cm / 59 kg | |
| Affiliations | LZC '29 — Leeuwarden, Friesland | NED |
| NOC | Netherlands | NED |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1960 Summer Olympics | Swimming (Aquatics) | NED |
Sieta Posthumus | |||
| 4 × 100 metres Freestyle Relay, Women (Olympic) | Netherlands |
