South Fork John Day River
| South Fork John Day River | |
| River | |
 South Fork John Day River at Dayville
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| Name origin: John Day, fur trapper | |
| Country | United States |
|---|---|
| State | Oregon |
| County | Harney, Grant |
| Source | |
| - location | near Alsup Mountain, Malheur National Forest, Harney County, Oregon |
| - elevation | 5,396 ft (1,645 m) |
| - coordinates | 43°55′09″N 119°19′17″W / 43.91917°N 119.32139°W |
| Mouth | John Day River |
| - location | Dayville, Grant County, Oregon |
| - elevation | 2,326 ft (709 m) |
| - coordinates | 44°28′26″N 119°32′10″W / 44.47389°N 119.53611°WCoordinates: 44°28′26″N 119°32′10″W / 44.47389°N 119.53611°W |
| Length | 60 mi (97 km) |
| Basin | 606 sq mi (1,570 km2) |
| Discharge | for Dayville, Oregon, near mouth |
| - average | 179 cu ft/s (5 m3/s) |
  Location of the mouth of the South Fork John Day River in Oregon
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The South Fork John Day River is a 60-mile (97 km) tributary of the John Day River in the U.S. state of Oregon. It begins in the Malheur National Forest in Harney County about 25 miles (40 km) north-northwest of Burns and flows generally north to Dayville, where it meets the main stem of the John Day River. Along the way, the stream passes through the abandoned town of Izee. Black Canyon Wilderness in the Ochoco National Forest lies within the river's drainage basin.
A total of 47 miles (76 km) of the river, from the Malheur National Forest boundary to Smoky Creek, are classified "recreational" in the National Wild and Scenic River (NWSR) system and offer opportunities for hiking, swimming, camping, hunting, and fishing.
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