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