| North Branch Calvin Run | |
| Name Other: | Tributary to Calvin Run |
| Map Size: | 300 |
| Pushpin Map: | USA Pennsylvania#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of North Branch Calvin Run mouth |
| Pushpin Map Alt: | Map of North Branch Calvin Run mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | Greene County |
| Length: | 2.47miles[1] |
| Discharge1 Location: | Calvin Run |
| Discharge1 Avg: | 2.54cuft/s at mouth with Calvin Run[2] |
| Source1: | Whiteley Creek divide |
| Source1 Location: | about 2 miles southeast of Kirby, PA[3] |
| Source1 Coordinates: | 39.7892°N -80.0878°W[4] |
| Source1 Elevation: | 1200feet |
| Mouth: | Calvin Run |
| Mouth Location: | about 2 miles northwest of Mount Morris, Pennsylvania |
| Mouth Coordinates: | 39.7606°N -80.0836°W |
| Mouth Elevation: | 955feet |
| Progression: | generally south |
| River System: | Monongahela River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | Stone House Road, North Branch Road (x2) |
North Branch Calvin Run is a 2.47miles long first-order tributary to Calvin Run in Greene County. This is the only stream of this name in the United States.[4]
North Branch Calvin Run rises about 2 miles southeast of Kirby, Pennsylvania and then flows southerly to join Calvin Run about 2 miles northwest of Mount Morris, Pennsylvania.[3]
North Branch Calvin Run drains of area, receives about 43.1 in/year of precipitation, and is about 78.8% forested.[2]