The Palace Armoury is an arms collection housed at the Grandmaster's Palace in Valletta, Malta. It was the main armoury of the Order of St. John in the 17th and 18th centuries, and as such it was the last arsenal established by a crusader military order. Although today only a part of the original armoury still survives, it is still one of the world's largest collections of arms and armour still housed in its original building. The Palace Armoury has been open to the public as a museum since 1860.