The Back Mountain is a region and former census-designated place (CDP) in Luzerne County, Pennsylvania, United States. It is near the cities of Scranton and Wilkes-Barre. The population was 33,551 as of 2016. The region has a total area of 117.59 square miles (304.6 km2). The area was not delineated as a CDP for the 2010 census. The name "Back Mountain" refers to the area's location behind the mountain ridge forming the northwest side of the Wyoming Valley. The area includes the townships of Dallas, Franklin, Jackson, Kingston, Lake, and Lehman. The region also includes the boroughs of Dallas and Harveys Lake. Each township and borough is independently governed.

Luzerne County is a county in the Commonwealth of Pennsylvania. According to the United States Census Bureau, the county has a total area of 906 square miles (2,350 km2), of which 890 square miles (2,300 km2) is land and 16 square miles (41 km2) is water. It is Northeastern Pennsylvania's second-largest county by total area. As of the 2020 census, the population was 325,594, making it the most populous county in the northeastern part of the state. The county seat and most populous city is Wilkes-Barre. Other populous communities include Hazleton, Kingston, Nanticoke, and Pittston. Luzerne County is included in the Scranton–Wilkes-Barre–Hazleton Metropolitan Statistical Area, which has a total population of 555,426 as of 2017. The county is part of the Northeastern Pennsylvania region of the state.