| Clark River | |
| Pushpin Map: | New Zealand#New Zealand South Island |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Clark River |
| Source1 Location: | Adelaide Tarn |
| Source1 Coordinates: | -40.941°N 172.5443°W |
| Mouth Location: | Aorere River |
| Mouth Coordinates: | -40.8548°N 172.464°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 15km (09miles) |
| Progression: | Clark River → Aorere River → Ruataniwha Inlet → Golden Bay / Mohua → Tasman Sea |
The Clark River is a river of northwestern South Island of New Zealand. The river flows northwest from its source in the Kahurangi National Park to reach the Aorere River at the foot of the Wakamarama Range 30km (20miles) from the Aorere's outflow into Golden Bay.