Pennsylvania Route 418 (PA 418) is a 2.75-mile-long (4.43 km) state highway located in Mercer County, Pennsylvania.

The route passes through residential areas, turning northeast onto Mercer Avenue and heading into the city of Farrell.

The road passes more homes and reaches an intersection with PA 518.

A short distance after this junction, PA 418 enters the city of Hermitage and heads into more wooded areas with a few residences.

The route turns north onto Maple Drive and reaches its northern terminus at US 62.