| Waireia River | |
|---|---|
 Route of the Waireia River | |
  Mouth of the Waireia River .png)  Waireia River (New Zealand) | |
| Location | |
| Country | New Zealand |
| Region | Auckland Region |
| Physical characteristics | |
| Source | |
| • coordinates | 36°19′53″S 174°25′15″E / 36.3314°S 174.4207°E |
| Mouth | Wharehine River |
• coordinates | 36°17′51″S 174°25′55″E / 36.2974°S 174.432°E |
| Length | 8 km (5 mi) |
| Basin features | |
| Progression | Waireia River → Wharehine River → Oruawharo River → Kaipara Harbour → Tasman Sea |
The Waireia River is a river of the Auckland Region of New Zealand's North Island. Part of the Kaipara Harbour system, it flows north to meet the Oruawharo River 10 kilometres (6 mi) west of Wellsford.