Pennsylvania Route 174 (PA 174) is a 28-mile-long (45 km) state highway located in Cumberland County, Pennsylvania. The western terminus is at U.S. Route 11 (US 11) and PA 533 in Shippensburg. The eastern terminus is at PA 641 in Monroe Township. PA 174 is a two-lane undivided road that runs through farmland in southern Cumberland County. The route heads east from Shippensburg and comes to an interchange with Interstate 81 (I-81). PA 174 continues through rural land, intersecting PA 233 in Dickinson, PA 465 in Mooredale, and PA 34 north of Mount Holly Springs before passing through Boiling Springs. From here, the route heads northeast and crosses PA 74 before coming to its end at PA 641 west of Mechanicsburg.