Dillsburg is a borough in York County, Pennsylvania, United States.

During the Civil War's Gettysburg Campaign, Dillsburg was twice invaded by Confederate cavalry, first by Albert G. Jenkins's brigade, then by Maj. Gen. J.E.B.

Anderson B. Quay House are listed on the National Register of Historic Places.

According to the United States Census Bureau, the borough has a total area of 0.8 square miles (2.1 km2), all land.

Dillsburg's Farmers Fair celebration is held annually during the third weekend in October.

Among the many attractions are the parades on Friday and Saturday evenings, the classic car and farm tractor parade Saturday afternoon, and Civil War reenactments at the nearby Dill's Tavern.