| Oswego Formation | |
| Type: | Formation |
| Age: | Late Ordovician |
| Period: | Late Ordovician |
| Region: | Appalachia and Southeastern United States |
| Country: | United States |
| Underlies: | Tuscarora Sandstone |
| Overlies: | Juniata Formation |
| Extent: | Virginia[1] and West Virginia |
The Oswego Formation is a geologic formation in West Virginia. It dates back to the Ordovician period.