| Barn River | |
|---|---|
 Route of the Barn River | |
.png)  Mouth of the Barn River   Barn River (South Island) | |
| Location | |
| Country | New Zealand |
| region | West Coast Region |
| District | Westland District |
| Physical characteristics | |
| Source | Hermitage Swamp |
| Mouth | Cascade River |
• coordinates | 44°2′58″S 168°23′27″E / 44.04944°S 168.39083°E |
• elevation | < 10 m (33 ft) |
| Length | 6.8 kilometres (4.2 mi) |
| Basin features | |
| Progression | Hermitage Swamp → Barn River → Cascade River |
| River system | Cascade River |
The Barn River is a small river in a remote area of the Westland district of New Zealand. Only 6 kilometres (4 mi) long, it acts as the primary drainage of the south half of the Hermitage Swamp near the mouth of the Cascade River.