| Mangapapa River | |
| Name Etymology: | Maori meaning "flat stream" |
| Pushpin Map: | New Zealand |
| Pushpin Map Size: | 300px |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Region |
| Subdivision Name2: | Manawatū-Whanganui |
| Subdivision Type3: | District |
| Subdivision Name3: | Rangitikei |
| Length: | 55km (34miles) |
| Source1: | west of Mataroa |
| Source1 Elevation: | 660m (2,170feet) |
| Mouth: | Turakina River |
| Mouth Coordinates: | -39.8029°N 175.5161°W |
| Mouth Elevation: | 150m (490feet) |
| Progression: | Mangapapa River |
| River System: | Turakina River → Turakina River |
The Mangapapa River is a river of the Manawatū-Whanganui region of New Zealand's North Island. The river rises near the remote settlement of Mangapapa, northwest of Mangaweka. It flows westward through heavily eroded hilly farmland to meet the Turakina River. There is a 12m (39feet) waterfall on the lower reaches of the river.