| Birth Place: | Amsterdam, the Netherlands |
| Height: | 1.75m (05.74feet) |
| Weight: | 70kg (150lb) |
| Sport: | Swimming |
| Club: | HDZ, Amsterdam |
| Show-Medals: | yes |
Josephina Johanna "Jopie" Troost (born 19 September 1942) is a retired Dutch swimmer who competed at the 1960 Summer Olympics in the 4 × 100 m freestyle relay. A medal favorite, the Dutch team was disqualified in the heats for a premature start by Sieta Posthumus. Troost was part of 4 × 100 m freestyle relay teams that set three national records in 1958.