| Rerewhakaaitu River | |
| Mouth Location: | Pacific Ocean |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 15abbr=onNaNabbr=on |
The Rerewhakaaitu River is a river of the Wellington Region of New Zealand's North Island. It flows southeast from its sources in rough hill country southeast of Martinborough, reaching the Pacific Ocean 40km (30miles) northeast of Cape Palliser.