| Oud Poelgeest Castle | |
|---|---|
| Oegstgeest, the Netherlands | |
 Castle Oud Poelgeest | |
  Oud Poelgeest Castle | |
| Coordinates | 52°10′47″N 4°29′06″E / 52.17972°N 4.48500°E |
| Type | Castle |
| Site information | |
| Open to the public | Yes as Hotel |
| Site history | |
| Built | 1668 |
| Built by | Erasmus den Otter |
| Materials | Brick |
Oud Poelgeest is a castle in Oegstgeest, north of Leiden, that was the former home of the Dutch scientist Herman Boerhaave (1668–1738). He was a Dutch humanist and physician of European fame.