Fort Glanville Conservation Park is a registered heritage conservation area in Semaphore South, South Australia, a seaside suburb of Adelaide, that incorporates a functional 19th century fort. The fort was built after more than 40 years of indecision over the defence of South Australia. It was the first colonial fortification in the state and is the best preserved and most functional in Australia. Fort Glanville was designed by Governor Major General Sir William Jervois and Lieutenant Colonel Peter Scratchley, both important figures in early Australian colonial defence. When built it was designed to defend both Semaphore's anchorage and shipping entering the Port River from naval attack.