Fort Vijfhuizen is one of forty-two forts in the Defense Line of Amsterdam (Dutch: stelling van Amsterdam), a World Heritage Site.
It is located in the town of Vijfhuizen on the ringvaart which surrounds the Haarlemmermeer polder.
The main fort is currently maintained by a charitable foundation called Kunstfort Vijfhuizen which leases space for twelve artist studios and a restaurant.
The fort is situated on a hill surrounded by a moat and accessible during opening hours.
It was built in 1889 and 1890 with sand taken from the excavations for a new sluice-gate complex in IJmuiden.