| Omaka River | |
| Source1 Location: | Mount Horrible |
| Mouth Location: | Opawa River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 36km (22miles) |
The Omaka River is a river of the Marlborough Region of New Zealand's South Island. It flows north from the slopes of Mount Horrible 30km (20miles) west of Seddon, reaching the Ōpaoa River at the eastern end of Renwick.
The New Zealand Ministry for Culture and Heritage gives a translation of "place of the stream" for Ōmaka.[1]