Mannington Township is a township in Salem County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 1,475, a decrease of 331 (−18.3%) from the 2010 census count of 1,806, which in turn reflected an increase of 247 (+15.8%) from the 1,559 counted in the 2000 census.

Salem County is the westernmost county in the U.S. state of New Jersey. Its western boundary is formed by the Delaware River and its eastern terminus is the Delaware Memorial Bridge, which connects the county with New Castle, Delaware. Its county seat is Salem. The county is part of the South Jersey region of the state.