| Reason Branch | |
| Name Other: | Tributary to Rocky River |
| Map Size: | 300 |
| Pushpin Map: | USA North Carolina#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Reason Branch mouth |
| Pushpin Map Alt: | Map of Reason Branch mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | North Carolina |
| Subdivision Type3: | County |
| Subdivision Name3: | Union |
| Length: | 3.04miles[1] |
| Discharge1 Location: | Rocky River |
| Discharge1 Avg: | 4cuft/s at mouth with Rocky River[2] |
| Source1: | Gold Branch divide |
| Source1 Location: | pond about 1 mile west of New Salem, North Carolina |
| Source1 Coordinates: | 35.1311°N -80.4017°W[3] |
| Source1 Elevation: | 545feet[4] |
| Mouth: | Rocky River |
| Mouth Location: | about 3 miles north-northwest of New Salem, North Carolina |
| Mouth Coordinates: | 35.1653°N -80.3892°W |
| Mouth Elevation: | 338feet |
| Progression: | Rocky River → Pee Dee River → Winyah Bay → Atlantic Ocean |
| River System: | Pee Dee |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | Bull Branch |
| Bridges: | Morgan Academy Road |
Reason Branch is a 3.04miles long 1st order tributary to the Rocky River in Union County, North Carolina. This is the only stream of this name in the United States.
Reason Branch rises in a pond about 1 mile west of New Salem, North Carolina and then flows northeast to join the Rocky River about 3 miles north-northwest of New Salem.[4]
Reason Branch drains of area, receives about 48.0 in/year of precipitation, has a wetness index of 393.52, and is about 43% forested.[2]