| Poerua River | |
| Pushpin Map: | New Zealand#New Zealand South Island |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Poerua River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | region |
| Subdivision Name2: | West Coast Region |
| Subdivision Type3: | District |
| Subdivision Name3: | Westland District |
| Length: | 35.4km (22miles) |
| Source1: | Poerua Glacier |
| Source1 Location: | Southern Alps / Kā Tiritiri o te Moana |
| Source1 Coordinates: | -43.2852°N 170.6129°W |
| Source1 Elevation: | 1380m (4,530feet) |
| Mouth: | Tasman Sea |
| Mouth Location: | Hikimutu Lagoon |
| Mouth Coordinates: | -43.0489°N 170.4101°W |
| Mouth Elevation: | 0m (00feet) |
| Tributaries Left: | McCullouchs Creek |
| Tributaries Right: | Willberg River, Dry Creek, Ferguson Creek, Pye Creek |
Poerua River is a river in Westland District in the West Coast region of New Zealand's South Island. It flows from its headwaters in the Southern Alps to the Tasman Sea near Harihari. The river is a trout and salmon fishing location and its mouth is where it is met by the Hinatua River and is located roughly a kilometre south of the Wanganui River's mouth. On the morning of 6 October 1999, a landslide from Mount Adams blocked the Poerua River, creating a landslide dam about 11 km upstream from the bridge over the river. Despite fears of flooding and other damage, there were relatively minimal impacts when the dam was breached six days later, though significant quantities of coarse gravel were deposited downstream and the river's course was changed in places.