Teylingen Castle (Dutch: Slot Teylingen) is a Dutch castle in the municipality of Teylingen, in the town of Voorhout, near the border with Sassenheim. It is presumably the family keep of the noble family , from which the Van Brederode family directly descended. The castle was originally built to protect the north-south route in Hollandic territory. Later it became a forester's castle for the forestry of the counts of Holland, starting with William IV, count of Holland.