Fort Glanville Conservation Park, Military heritage site and nature reserve in Semaphore Park, Adelaide, Australia.

Fort Glanville Conservation Park is a lunette-shaped defensible battery built from 1878 to 1882, with a riveted metal carriage and a light grey 10-inch gun on a pale grey cylindrical base. A white sign reading "10 INCH GUN" stands in front of the base, near a brick wall and paved surface.

Construction of Fort Glanville began in 1878; it was officially opened in October 1880 and completed by 1882, making it South Australia's first colonial fortification. It was designed by Governor Major General Sir William Jervois and Lieutenant Colonel Peter Scratchley to defend the Semaphore anchorage and shipping entering the Port River. Fort Largs surpassed it in strategic importance in 1890, and by the end of the 19th century it was largely unused.

The Fort Glanville Historical Association maintains military traditions through regular demonstrations of artillery drills and weapon operations.

The park is accessible by public transport or car, with parking areas and picnic spots throughout the grounds. Walking paths connect the main features, making it easy to explore at your own pace.

The fort's main armament is two rifled muzzle-loading 10-inch 20-ton guns, backed by two RML 64-pounder 64 cwt guns, a configuration now rare. Three of the original 19th-century cannons have been restored to working condition and are fired during open days. A white sign beside one carriage reads "10 INCH GUN".