| Big Piney River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Missouri |
| Subdivision Type3: | Region |
| Subdivision Name3: | Ozark Plateau |
| Subdivision Type5: | Cities |
| Subdivision Name5: | Cabool, Houston, Fort Leonard Wood |
| Discharge1 Location: | Fort Leonard Wood, MO |
| Discharge1 Avg: | 685 cu/ft. per sec.[1] |
| Source1 Location: | Dunn just west of Cabool, Missouri |
| Source1 Coordinates: | 37.1464°N -92.1883°W |
| Source1 Elevation: | 1500feet[2] |
| Mouth: | Gasconade River |
| Mouth Location: | North of Devils Elbow, Missouri, Pulaski County, North-Central Ozark Plateau, Missouri |
| Mouth Coordinates: | 37.8836°N -92.0642°W |
| Mouth Elevation: | 689feet |
| Tributaries Left: | West Piney Creek, Paddy Creek |
| Tributaries Right: | Arthur Creek, Indian Creek |
The Big Piney River is a 110adj=midNaNadj=mid[3] tributary of the Gasconade River in south central Missouri in the United States. Via the Gasconade and Missouri rivers, it is part of the Mississippi River basin.
The stream headwaters are located in southwest Texas County just north of the community of Dunn and U. S. Route 60. The stream flows east and southeast passing just south of Cabool passing under Route 60 Business, Missouri Route 181 and U. S. Route 63. The stream course turns northeast and runs parallel to Route 63 passing under it three times before turning northwest to the north of Simmons. The stream meanders north passing under Missouri Route 17 to the west of Houston and east of Bucyrus. The stream continues north passing under Missouri Route 32 and on past Hazleton passing the Paddy Creek Recreation Area and the Slabtown Spring area. The stream enters southeastern Pulaski County. It continues north past Ross Bridge and through an eastern section of the Fort Leonard Wood reservation. North of Fort Leonard Wood the stream veers sharply east, briefly passing through a section of Phelps County north of Spring Creek. It meanders back west and flows past Moab and Devils Elbow before passing under Interstate 44 and past Hooker before reaching its confluence with the Gasconade.[4]
Big Piney River was so named on account of thick pine timber near its banks.[5]