Muncy is a borough in Lycoming County, Pennsylvania. The name Muncy comes from the Munsee Indians who once lived in the area. The population was 2,442 at the 2020 census. It is part of the Williamsport, Pennsylvania Metropolitan Statistical Area. Muncy is located on the West Branch Susquehanna River, just south of the confluence of Muncy Creek with the river. Currently the borough president is Bill Scott and the mayor is Jon Ort.

Lycoming County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 114,188. Its county seat is Williamsport. The county is part of the Central Pennsylvania region of the state.