Pennsylvania Route 308 is a 28.5-mile-long (45.9 km) state highway located in Butler and Venango Counties in Pennsylvania. The southern terminus is at PA 8 near Butler. The northern terminus is at State Route 3013 north of an interchange with the PA 8 expressway in Pearl.

Venango County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 50,454. Its county seat is Franklin. The county was created in 1800 and later organized in 1805. The county is part of the Northwest Pennsylvania region of the state.