| Little Boulder River | |
| Pushpin Map: | New Zealand#New Zealand South Island |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Little Boulder River |
| Source1 Location: | Lookout Knob |
| Source1 Coordinates: | -40.8191°N 172.5932°W |
| Mouth Location: | Aorere River |
| Mouth Coordinates: | -40.7666°N 172.5971°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Progression: | Little Boulder River → Aorere River → Ruataniwha Inlet → Golden Bay / Mohua → Tasman Sea |
| Tributaries Left: | Bert Creek, Graham Creek |
The Little Boulder River is a river of the Tasman Region of New Zealand's South Island. It flows from its sources within Kahurangi National Park to reach the Aorere River south of Collingwood.