Voorhout is a village and former municipality in the western Netherlands, in the province of South Holland. The former municipality covered an area of 12.59 km² of which 0.33 km² is covered by water, and had a population of 14,792 in 2004. Together with Sassenheim and Warmond, it became part of the Teylingen municipality on January 1, 2006. Voorhout is located in an area called the "Dune and Bulb Region".
It also included the communities of Piet Gijzenbrug and Teijlingen with the Slot Teylingen.