| Oostzaan | |
| Settlement Type: | Municipality |
| Flag Size: | 100x67px |
| Map Alt: | Highlighted position of Oostzaan in a municipal map of North Holland |
| Coordinates: | 52.4333°N 57°W |
| Subdivision Type: | Country |
| Subdivision Name: | Netherlands |
| Subdivision Type1: | Province |
| Subdivision Name1: | North Holland |
| Government Footnotes: | [1] |
| Governing Body: | Municipal council |
| Leader Party: | VVD |
| Leader Title: | Mayor |
| Leader Name: | Marvin Polak |
| Unit Pref: | Metric |
| Elevation Footnotes: | [2] |
| Elevation M: | 0 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postcode |
| Postal Code: | 1510–1511 |
| Area Code Type: | Area code |
| Area Code: | 075 |
Oostzaan (in Dutch; Flemish pronounced as /oːstˈsaːn/) is a municipality and a town in the Zaanstreek, Netherlands, in the province of North Holland. The municipality had a population of in . Oostzaan has a total area of NaNOostzaan}} of which NaNOostzaan}} is water.
Oostzaan - together with 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.
17th century Oostzaan was the home of the pirate Claes Compaen. Originally a privateer for the Dutch Republic, he soon began to act as a pirate, capturing several hundred ships.[3] A street in Oostzaan is named after him.
The town has a Reformed church with a cruciform groundplan, the Great Church (1760), which contains two ship models that recall the days when Oostzaan was an important sea-faring community. In the Oostzijderveld area of Oostzaan stands a windmill, De Windjager (The Wind Hunter).
Oostzaan consists of several hamlets,
Kerkbuurt and the northern part of Zuideinde are the center of Oostzaan.
The municipal council of Oostzaan consists of 13 seats, which at the 2022 municipal elections divided as follows:[4]
The poultry company Meyn Food Processing Technology is headquartered in Oostzaan.