Collins Barracks () is a former military barracks in the Arbour Hill area of Dublin, Ireland. The buildings are now the National Museum of Ireland, Decorative Arts and History. Housing both British armed forces, and Irish army garrisons through three centuries, the barracks were the oldest continuously occupied example in the world. Originally called simply The Barracks, and later The Royal Barracks, the name was changed to Collins Barracks when handed over to the Irish Free State in 1922.