| Big River | |
| Pushpin Map: | New Zealand#New Zealand South Island |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Big River |
| Source1 Location: | Tubman Hill |
| Source1 Coordinates: | -40.9212°N 172.2947°W |
| Mouth Location: | Tasman Sea |
| Mouth Coordinates: | -40.7659°N 172.2578°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Progression: | Big River → Tasman Sea |
| Tributaries Left: | Weka Creek, Saxon River, Juno Creek |
| Tributaries Right: | Tasmanian Creek, Shiner Brook, Cave Brook, Sheep Creek, Corkscrew Creek, Lilian Creek, Vesta Creek, Slip Stream, Pallas Stream, Ceres Creek |
The Big River is a river in the Tasman District of the South Island of New Zealand. It rises on the slopes of Tubman Hill, elevation 897m (2,943feet) in the Wakamarama Range. It flows northwest then north to the Tasman Sea.