Schalun Castle also known colloquially as Wildschloss ("Castle in the wild"), is a castle ruin located in the municipality of Vaduz, Liechtenstein. It lies in the mountains, roughly 1 kilometer to the northeast from the town centre of Vaduz, the capital of Liechtenstein. It is freely open to tourists and accessible by foot or mountain bike via a local footpath. Schalun Castle is one of the five existing castles in Liechtenstein and one of the three ruined ones in the country.