Fort Mott, located in Pennsville, Salem County, New Jersey, United States, was part of the Harbor Defenses of the Delaware, a three-fort defense system designed for the Delaware River during the Reconstruction era and Endicott program modernization periods following the American Civil War and in the 1890s. The other two forts in the system were Fort Delaware on Pea Patch Island and Fort DuPont in Delaware City, Delaware. It was active for the Spanish American War and World War I.