Sassenheim (Dutch pronunciation: [ˈsɑsə(n)ɦɛim] ⓘ) is a town and former municipality in the western Netherlands, in the province of South Holland.

The name Sassenheim consists of two parts; the first (Sassen) means Saxons, and the second portion (heim) is Old Frankish for "home".

Along this road many castles and estates were built, including the mansions along Sassenheim's Main Street (Hoofdstraat) dating from the early 1900s.

Sassenheim is located in an area called the "Dune and Bulb Region" (Duin- en Bollenstreek).

This stronghold was built to guard the north–south route in Holland and later became a residence of countess Jacoba of Bavaria.