| Ongarue River | |
| Name Etymology: | Māori meaning "place of shaking" |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Region |
| Subdivision Name2: | Manawatū-Whanganui |
| Subdivision Type3: | Towns |
| Subdivision Name3: | Taumarunui |
| Subdivision Type4: | Settlements |
| Subdivision Name4: | Ongarue, Waimiha |
| Length: | 73km (45miles) |
| Source1: | Hauhungaroa Range |
| Source1 Location: | Pureora |
| Source1 Elevation: | 1100m (3,600feet) |
| Mouth: | Whanganui River |
| Mouth Location: | Taumarunui |
| Mouth Coordinates: | -38.8919°N 175.2531°W |
| Mouth Elevation: | 144m (472feet) |
| Progression: | Ongarue River → Whanganui River |
| River System: | Whanganui River |
| Tributaries Left: | Maramataha River, Taringamotu River |
| Waterfalls: | Wilton Falls, Kawauariki Falls |
The Ongarue River is a river of the Manawatū-Whanganui region of New Zealand's North Island. A major tributary of the Whanganui River, it flows west then south from its sources on Pureora and north of the Hauhungaroa Range, northwest of Lake Taupō, before reaching the Whanganui River at the town of Taumarunui. The valley is followed by State Highway 4, from near Ongarue,[1] and by the North Island Main Trunk railway for about 30km (20miles),[2] from near Waimiha.
Tributaries of the Ongarue include the Maramataha and Taringamotu River
The maximum flow in the river is about .
Kayaks can navigate up to Waimiha, except in a narrow gorge near Paraketu and shallow rapids below Taringamotu.[4]