Heidelberg Township is a township in Lebanon County, Pennsylvania, United States. The population was 4,080 at the 2020 census. It is part of the Lebanon, Pennsylvania Metropolitan Statistical Area.

Lebanon County is a county in the Commonwealth of Pennsylvania, United States. As of the 2020 census, the population was 143,257. Its county seat is the city of Lebanon. It lies 72 miles northwest of Philadelphia, which is the nearest major city. The county is part of the South Central Pennsylvania region of the state.