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 original plans for Fort Mott (initially called the "Battery at Finn's Point") specified eleven gun emplacements for Rodman smoothbore guns and a mortar battery with six emplacements.

A new Fort Mott was one of the results, and it was completed by 1902 as part of the Harbor Defenses of the Delaware.

A parados (basically an artificial hill) and moat were placed behind the gun batteries to impede an assault from the landward side.

These casemated light guns, intended to protect an underwater minefield in the river by driving off minesweepers, were a unique installation in US forts of this era, in which virtually all emplacements were open-top.

In 1920 the unique Battery Edwards was disarmed as part of a general removal from service of the 3-inch gun M1898.

New Jersey acquired the military reservation as a historic site and State park in 1947.

[8][3] As with most post-Civil War US coastal fortifications outside the Philippines, Fort Mott's guns were fired only for training and testing, never in battle.