Forty Fort was a stronghold built by settlers from Connecticut, on the Susquehanna River in what is now Luzerne County, Pennsylvania.

Before the American Revolutionary War, both Connecticut and Pennsylvania claimed this territory, as Connecticut had laid claim to a wide swath of land to its west based on its colonial charter.

The fort is named for the forty families from Connecticut who arrived in the Wyoming Valley in 1769.

Construction of the fort began in 1770, however, it fell into disrepair until rebuilt in 1777 during the Revolutionary War.

Barracks and other buildings were constructed along the double thick, twelve foot high stockade wall.