Pennsylvania Route 34 (PA 34) is a state route located in southern Pennsylvania. The southern terminus of the route is at U.S. Route 15 Business (US 15 Bus.) in Gettysburg. The northern terminus is at US 11/US 15 south of Liverpool. PA 34 heads north from Gettysburg through farmland in northern Adams County, passing through Biglerville. The route crosses South Mountain into Cumberland County and reaches Mount Holly Springs, where it intersects PA 94. PA 34 heads north into the agricultural Cumberland Valley and heads north to Carlisle, where it has an interchange with Interstate 81 (I-81) in the southern part of town and intersects US 11/PA 74/PA 641 in the downtown area. The route continues north through more rural land and crosses Blue Mountain into Perry County, where it continues through the Ridge-and-Valley Appalachians, winding north to New Bloomfield. From here, PA 34 continues northeast to Newport, where it crosses the Juniata River and reaches an interchange with US 22/US 322, before heading to its terminus at US 11/US 15 near the Susquehanna River.