| North Branch Grass River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York |
| Source1: | Church Pond |
| Mouth: | Grass River |
| Mouth Location: | Russell, New York |
| Mouth Coordinates: | 44.4244°N -75.1075°W |
| Mouth Elevation: | 620feet |
| Basin Size: | 60.2sqmi |
| Tributaries Left: | Gulf Brook |
| Tributaries Right: | La Rock Creek |
The North Branch Grass River flows into the Grass River near Russell, New York.[1]