The Mifflintown Formation is a geologic formation in Maryland, Pennsylvania, and Virginia. It preserves fossils dating back to the Silurian period. The type location is near Mifflintown, Pennsylvania.^[1]

• List of fossiliferous stratigraphic units in Maryland
• Paleontology in Maryland

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021. ^{[user-generated source]}