Pennsylvania Route 863 (PA 863) is a state highway in Lehigh County, Pennsylvania, in the Lehigh Valley region of the state. The route runs 13.99 mi (22.51 km) from U.S. Route 222 (US 222) in Upper Macungie Township north to PA 143 in the community of Lynnport in Lynn Township. The route is a two-lane undivided road that runs southeast-northwest through rural areas in western Lehigh County. Along the way, PA 863 has an interchange with Interstate 78 (I-78)/US 22 in Weisenberg Township. The road was originally unpaved, being improved to a bituminous road by the 1940s and a paved road by 1950. PA 863 was designated on March 8, 1962.