| Mangawharariki River | |
| Source1 Location: | Ruahine Range |
| Mouth Location: | Rangitikei River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 24km (15miles) |
The Mangawharariki River is a river of the Manawatū-Whanganui region of New Zealand's North Island. It flows northwest from the Ruahine Range to meet the Rangitikei River at Mangaweka.