- For other places with the same name, see Castletown (disambiguation)
Castletown and Portland Harbour, seen from The Verne. The National Sailing Academy and Portland Castle are on the left. The large buildings in the foreground are former naval buildings, now converted into luxury flats.
Portland Castle entrance.
Castletown is a small village in Underhill on the Isle of Portland in Dorset. It has a sandy beach and has a working port, Portland Port. The village itself is on the shores of Portland Harbour, and includes Portland Castle and the Weymouth and Portland National Sailing Academy. The village has a long naval history, and the Royal Navy had a base in the harbour until 1999. Now Portland Port is commercial, whilst still servicing and berthing Royal Fleet Auxiliary ships.
