| Rainy River | |
| Mouth Location: | Pelorus River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 5km (03miles) |
| Source1 Elevation: | 790m (2,590feet) |
| Mouth Elevation: | 40m (130feet) |
The Rainy River is a short river of the northeastern Marlborough Region of New Zealand's South Island. It flows north from the Richmond Range into the Pelorus River, which it reaches five kilometres west of Pelorus Bridge.[1]