| Ngatiawa River | |
| Pushpin Map: | New Zealand#New Zealand North Island |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Ngatiawa River |
| Source1 Location: | Tararua Range |
| Source1 Coordinates: | -40.9585°N 175.1591°W |
| Mouth Location: | Waikanae River |
| Mouth Coordinates: | -40.8977°N 175.0947°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Progression: | Ngatiawa River → Waikanae River → Rauoterangi Channel → South Taranaki Bight → Tasman Sea |
| Basin Landmarks: | Tararua Forest Park, Reikorangi |
The Ngatiawa River is a river on the Kāpiti Coast of New Zealand's North Island that is a major tributary of the Waikanae River. Its headwaters are in the Tararua Range and it flows north and northwest through the Akatarawa Valley to Reikorangi, where it meets the Waikanae River.