Oostzaan is a municipality and a town in the Zaanstreek in the province of North Holland. Oostzaan, Westzaan and Assendelft are considered the "mother towns" of the Zaanstreek (the region around the river Zaan), of which they are the three oldest towns. Oostzaan also played a role in the VOC and WIC shipping and shipbuilding during the Golden Age of the Netherlands. In the Oostzijderveld area of Oostzaan stands a windmill, De Windjager (The Wind Hunter).
