| Glenroy River | |
| Pushpin Map: | New Zealand South Island#New Zealand |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Glenroy River |
| Source1: | Glenroy River (main branch) |
| Source1 Coordinates: | -42.3002°N 172.4333°W |
| Source2: | Glenroy River East Branch |
| Source2 Coordinates: | -42.0867°N 172.4059°W |
| Mouth: | Mātakitaki River |
| Mouth Coordinates: | -42.001°N 172.3347°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | District |
| Subdivision Name2: | Tasman |
| Progression: | Glenroy River → Mātakitaki River → Buller River → Tasman Sea |
| River System: | Buller River |
| Tributaries Left: | Mount Cann Creek, Granity Creek |
| Tributaries Right: | Branch Creek, Pedro Creek, Shale Creek, Cascade Creek, Davis Creek |
The Glenroy River is a tributary of the Mātakitaki River in the north of the South Island of New Zealand. It is widely known as a short class 4 river (River difficulty classification system for rafting).