| Dillsboro Formation | |
| Type: | Formation |
| Age: | Ordovician |
| Period: | Ordovician |
| Region: | Indiana, Ohio |
| Country: | United States |
| Unitof: | Maquoketa Group |
| Underlies: | Fort Atkinson Limestone and Whitewater Formation |
| Overlies: | Kope Formation |
The Dillsboro Formation is a geologic formation in Ohio. It preserves fossils dating back to the Ordovician period.