Fort Stark is a former military fortification in New Castle, New Hampshire, United States. Located at Jerry's Point (also called Jaffrey's Point) on the southeastern tip of New Castle Island, most of the surviving fort was developed in the early 20th century, following the Spanish–American War, although there were several earlier fortifications on the site, portions of which survive. The fort was named for John Stark, a New Hampshire officer who distinguished himself at the Battle of Bennington in the American Revolution. The purpose of Fort Stark was to defend the harbor of nearby Portsmouth and the Portsmouth Naval Shipyard. The fort remained in active use through the Second World War, after which it was used for reserve training by the US Navy. The property was partially turned over to