Gaskins Run is a tributary of the Susquehanna River in Montour County and Northumberland County, in Pennsylvania, in the United States. It is approximately 2.1 miles (3.4 km) long and flows through Liberty Township, Montour County, Mahoning Township, Montour County. The watershed of the stream has an area of 1.04 square miles (2.7 km2). At least one bridge crosses the stream. It is considered to be both a Coldwater Fishery and a Migratory Fishery.