| Ronga River | |
| Mouth Location: | Rai River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 100NaN0 |
The Ronga River is a river of the Marlborough Region of New Zealand's South Island. Although its source is on a ridge only 3km (02miles) from the island's north coast, the river flows south, reaching the Rai River close to the township of Rai Valley.