Assendelft is a town in the Dutch province of North Holland. It is a part of the municipality of Zaanstad. Assendelft was a separate municipality until 1974, when the municipality of Zaanstad was formed. It is part of the Amsterdam Agglomeration (GA). The North Sea Canal connects Assendelft with Amsterdam and Velsen, and it lies about 13 km northeast of Haarlem and about 15 km south of Alkmaar.