| Mahitahi River | |
| Source1 Location: | Southern Alps |
| Mouth Location: | Bruce Bay |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 29km (18miles) |
The Mahitahi River is a river of the southwest of New Zealand's South Island. It flows northwest from the Hooker Range, part of the Southern Alps, reaching the Tasman Sea at Bruce Bay.