Kern Run is a tributary of Middle Creek in Snyder County, Pennsylvania, in the United States.

Kern Run is dammed in one place to produce a 24-acre (9.7 ha) lake for drinking water and flood control.

At this point, it turns north-northeast for more than a mile, passing through Beavertown and reentering Beaver Township.

A short distance north of Beavertown, it receives the tributary Wetzel Run from the right and turns north-northwest for several tenths of a mile, passing between Freestone Ridge and Thomas Ridge and then reaching its confluence with Middle Creek.

[1] Kern Run joins Middle Creek 22.02 miles (35.44 km) upstream of its mouth.

[4] North-dipping rock of the Bloomsburg Formation has been discovered on a quarry on Kern Run, approximately 0.75 miles (1.21 km) south of Beavertown.

The lake created by the dam typically has a surface area of 24 acres (9.7 ha), and a volume of 248 acre-feet.

[3] A concrete tee beam bridge carrying State Route 4007 and a township road over Kern Run was built north of Beavertown in 1922 and is 40.0 feet (12.2 m) long.

It is used for drinking water and flood control and is owned by the Spring Township Municipal Authority.

[7] The Spring Township Municipal Authority uses the lake as its primary water supply to serve approximately 1000 people.