Pigeon Run is a tributary of Sullivan Branch in Sullivan County, Pennsylvania, in the United States. It is approximately 1.3 miles (2.1 km) long and flows through Davidson Township. Its watershed has an area of 0.78 square miles (2.0 km2). The stream has a low pH and sometimes has poor water quality, although that could potentially be remedied. The main rock formations in the area are the Catskill Formation, the Huntley Mountain Formation, and the Burgoon Sandstone. The main soil associations in the vicinity of the stream are the Deep-Wellsboro-Oquaga association, the Norwich association, the Morris association, and the Oquaga association.