The Royal Hospital Haslar in Gosport, Hampshire, which was also known as the Royal Naval Hospital Haslar, was one of Britain's leading Royal Naval Hospitals (and latterly a tri-service MOD hospital) for over 250 years. Built in the 1740s, it was reputedly the largest hospital in the world when it opened, and the largest brick-built building in Europe.
In 1998 the closure of the hospital was announced, conditional on the establishment of an MOD Hospital Unit at a nearby civilian hospital. In 2007 the military withdrew; Haslar then continued to function for a short time under civilian management, before closing entirely in 2009.