Lochranza Castle is a medieval castle on the Isle of Arran in southwestern Scotland. It sits on a narrow strip of land that juts out into Loch Ranza, and even though it is in ruins, it is still a fascinating castle to visit. Originally the castle was an old hall house built in the 1200s, but in the late 1500s it was incorporated into a newer tower house. The older castle had its main entrance one level up from the ground level. It was accessed by wooden stairs that could be removed if the castle was under attack. When the castle was rebuilt, the entrance was moved to the ground level.
Lochranza Castle was most likely owned by the MacSween family at one time, though ownership changed around the time of its reconstruction. When the tower house was built, the tower stood five stories tall. Today it is possible to access the ground level at the north and south ends of the castle as well as parts of the upper level.