Pennsylvania Route 136 (PA 136) is a 40-mile-long (64 km) state highway located in Washington, Allegheny, and Westmoreland Counties in Pennsylvania. The western terminus is at US 40 and PA 18 in Washington. The eastern terminus is at US 30 in Greensburg. PA 136 was established in September 1964 to replace the stretch of PA 31 from Greensburg to Washington while the section west of Washington was re-designated as PA 844.