The fortifications of Malta consist of a number of walled cities, citadels, forts, towers, batteries, redoubts, entrenchments and pillboxes. The fortifications were built over thousands of years, from around 1450 BC to the mid-20th century, and they are a result of the Maltese islands' strategic position and natural harbours, which have made them very desirable for various powers.
The earliest known fortifications in Malta are defensive walls built around Bronze Age settlements. The Phoenicians, Romans and Byzantines built a number of defensive walls around important settlements, but very little remains of these survive today. By the late medieval period, the main fortifications on Malta were the capital Mdina, the Cittadella on Gozo, the Castrum Maris and a few coastal towers or lookout posts.
The fortifications of Malta were greatly improved while the islands were ruled by the Order of St. John between 1530 and 1798. The Hospitallers built new bastioned fortifications, such as the fortifications of Birgu and Valletta, and upgraded the medieval defences. By the end of the 18th century, Malta had extensive fortifications around the Grand Harbour and Marsamxett, as well as a coastal defence system consisting of towers, batteries, redoubts and entrenchments.