Rijswijk, formerly known as Ryswick in English, is a town and municipality in the Western Netherlands, in the province of South Holland. Its population was 53,467 in 2019, and it has an area of 14.49 km², 0.53 km² of which is water.
The municipality also includes the former villages 't Haantje and Sion, currently also known as RijswijkBuiten.