| Ngatau River | |
| Pushpin Map: | New Zealand South Island#New Zealand |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Ngatau River |
| Source1: | Dispute Glacier |
| Source1 Coordinates: | -44.1084°N 169.0018°W |
| Mouth Location: | Okuru River |
| Mouth Coordinates: | -44.0527°N 169.1463°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Region |
| Subdivision Name2: | West Coast |
| Subdivision Type3: | District |
| Subdivision Name3: | Westland |
| Length: | 150NaN0 |
| Progression: | Ngatau River → Okuru River → Tasman Sea |
| Tributaries Left: | Dernier Torrent, Shale Stream, Deepworn Torrent, Twinkle Brook, Tinkle Rill |
| Tributaries Right: | Ultima Creek, Flicker Creek |
The Ngatau River is a river of the West Coast region of New Zealand's South Island. It flows north-west from its sources in the Southern Alps to meet the Okuru River 20km (10miles) south-east of Haast. The river's entire length is within Mount Aspiring National Park.