| Waterschap Noorderzijlvest | |
| Native Name Lang: | nl |
| Shield Alt: | Coat of Arms |
| Subdivision Type: | Country |
| Subdivision Name: | Netherlands |
| Subdivision Type1: | Province |
| Subdivision Name1: | Groningen, Friesland, Drenthe |
| Seat Type: | Seat (waterschapshuis) |
| Seat: | Groningen |
| Leader Title: | Dijkgraaf |
| Leader Name: | Bert Middel[1] |
| Unit Pref: | Metric |
| Area Footnotes: | [2] |
| Area Total Km2: | 1440 |
| Population Density Km2: | auto |
| Utc Offset1: | +1 |
| Utc Offset1 Dst: | +2 |
Waterschap Noorderzijlvest (WNZV) is a Dutch regional water authority covering the provinces of Groningen, Friesland, and Drenthe. It has its seat in the city of Groningen. It is responsible for water management, water quality and sewage water treatment in its catchment area.
Like many of the present water boards in the Netherlands, WNZV was created through a series of mergers of smaller regional boards over centuries. The documented history of these smaller boards and the dike rights that preceded them goes as far back as 1408.[3] The present WNZV was created in the year 2000 from the merger of Water Board Noorderzijlvest, Zuiveringschap Drenthe and the Service Purification Management of Groningen province.[4]