| Zuylen Castle | |
| Native Name: | Slot Zuylen |
| Location: | Oud-Zuilen, the Netherlands |
| Map Type: | Netherlands |
| Coordinates: | 52.1271°N 5.073°W |
| Map Size: | 250px |
| Type: | Castle |
| Built: | 13th century; rebuilt 1510–1522 |
| Builder: | Lord van Suilen en Anholt (medieval period); possibly Rombout II Keldermans around 1520 for the main building and entrance gate; garden partly designed by J.D. Zocher jr. around 1840 |
| Materials: | Brick |
| Demolished: | 1422 |
| Condition: | Good |
| Open To Public: | Yes |
| Image2 Size: | 250px |
Zuylen Castle (Dutch: Slot Zuylen - in Dutch; Flemish pronounced as /slɔt ˈzœylən/) is a Dutch castle at the village of Oud-Zuilen just north of the city of Utrecht. It is located along the river Vecht at the southern end of the Vechtstreek.
The castle was originally built in the 13th century by lord van Suilen en Anholt as a simple donjon. In 1422 during the Hook and Cod wars the castle was completely demolished. In 1510 rebuilding started. In 1752 the castle was modified for the last time. It holds a tapestry by the Delft carpet weaver Maximiliaan van der Gught. Its past inhabitants include Steven van der Hagen and Belle van Zuylen.