| Waitewaewae River | |
| Pushpin Map: | New Zealand#New Zealand North Island |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Waitewaewae River |
| Source1: | West Waitewaewae River |
| Source1 Location: | Waitewaewae, Tararua Range |
| Source1 Coordinates: | -40.7528°N 175.2962°W |
| Source2: | East Waitewaewae River |
| Source2 Location: | Tararua Range |
| Source2 Coordinates: | -40.7506°N 175.3093°W |
| Mouth Location: | Ōtaki River |
| Mouth Coordinates: | -37.9431°N 177.0094°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 10abbr=onNaNabbr=on |
| Progression: | Waitewaewae River → Ōtaki River → South Taranaki Bight → Tasman Sea |
| Tributaries Left: | Prout Stream, |
| Tributaries Right: | Mick Stream, Chaney Creek, Boyd-Wilson Creek |
| Basin Landmarks: | Tararua Forest Park |
The Waitewaewae River is a river of the Wellington Region of New Zealand's North Island. An upper tributary of the Ōtaki River, it flows south through Tararua Forest Park to reach the Ōtaki 20km (10miles) east of Waikanae. The river has two major tributary sections: the West Waitewaewae River which flows from Waitewaewae, and the East Waitewaewae River.