| Pahaoa River | |
| Mouth Location: | Pacific Ocean |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 41km (25miles) |
The Pahaoa River is a river of the Wairarapa, in the Wellington Region of New Zealand's North Island. It winds through rough hill country to the southwest of Masterton, initially flowing southwest before turning southeast to reach the Pacific Ocean 25km (16miles) southeast of Martinborough.