Pennsylvania Castle is a Gothic Revival mansion on the Isle of Portland, Dorset, England. It is located in Wakeham, and overlooks Church Ope Cove. The castle is Grade II Listed. The gatehouse and lodges are also Grade II Listed though now in separate ownership. After becoming a hotel in 1950, it reverted to being a private residence in the 1990s. It is now hired out for functions and events, and is Portland's most expensive residential property.