| Pahi River | |
| Mouth Location: | Arapaoa River, Kaipara Harbour |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 150NaN0 |
The Pahi River is a river of the Northland Region of New Zealand's North Island. It flows generally west from its origins southwest of Maungaturoto, and the last few kilometres of its length form an upper silty arm of the Kaipara Harbour. It forms one of the arms of the Arapaoa River, in the northeastern part of the harbour's system.