Sassenheim is a town and former municipality in the western Netherlands, in the province of South Holland.
The former municipality covered an area of 6.62 km² and had a population of 14,906 in 2005. Since 1 January 2006, it is part of the Teylingen municipality. In 2020, the population reached 15,755.
The name Sassenheim consists of two parts; the first means Saxons, and the second portion is Old Frankish for "home".