Buck Run is a tributary of Little Muncy Creek in Lycoming County, Pennsylvania, in the United States.

Buck Run begins in Jordan Township, near Pennsylvania Route 239, at the base of Huckleberry Mountain.

[1] Buck Run joins Little Muncy Creek 21.16 miles (34.05 km) upstream of its mouth.

[3] Buck Run is being considered for wild trout designation by the Pennsylvania Fish and Boat Commission.

The stream was surveyed on July 2, 2013 and listed on the Pennsylvania Fish and Boat Commission website as being considered for wild trout designation on January 20, 2015.