| Medway River | |
| Source1 Location: | Inland Kaikoura Range |
| Mouth Location: | Awatere River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 22km (14miles) |
The Medway River is a river of the Marlborough Region of New Zealand's South Island. It flows northwest then north from its sources in the Inland Kaikoura Range to meet the Awatere River 20km (10miles) southwest of Seddon.