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".

Teylingen is a municipality in the Western Netherlands, in the province of South Holland. It was created on 1 January 2006, through the amalgamation of Sassenheim, Voorhout and Warmond. It is named after Teylingen Castle, located in Voorhout. In 2019, it had a population of 37,061.