| Ōwaka River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Island |
| Subdivision Name2: | South Island |
| Subdivision Type3: | Area |
| Subdivision Name3: | The Catlins |
| Subdivision Type4: | District |
| Subdivision Name4: | Clutha |
| Length: | 30km (20miles) |
| Source1 Location: | Mount Rosebery |
| Mouth: | Pacific Ocean |
| Mouth Location: | Pounawea |
| Mouth Coordinates: | -46.4667°N 211°W |
The Ōwaka River, until 2019 officially the Owaka River, flows southeastward through The Catlins, an area of the southern South Island of New Zealand. Its total length is 30km (20miles), and it shares the estuary of the Catlins River, flowing into the Pacific Ocean at Pounawea, 28km (17miles) south of Balclutha. Its source is on the slopes of Mount Rosebery, 12km (07miles) south of Clinton. The Ōwaka River is located within the Clutha District.
The small town of Owaka is situated about one kilometre from the south bank of the river. The locality of Tahora was located at the Ōwaka River where the road and railway crossed the river; there is little trace of that settlement visible today.