Inveraray Castle (Gaelic Caisteal Inbhir Aora, pronounced [ˈkʰaʃtʲal iɲɪɾʲˈɯːɾə]) is a country house near Inveraray in the county of Argyll, in western Scotland, on the shore of Loch Fyne, Scotland’s longest sea loch. It has been the seat of the Duke of Argyll, chief of Clan Campbell, since the 17th century.
The castle is open to vistors. Its collection includes more than 1,300 pikes, muskets, swords and other weapons.
The 13th Duke and his family live in private apartments occupying two floors and set between two of the castle's crenellated circular towers. Recent renovations included the installation of the house's first central heating.
Inveraray Castle is a Category A listed building. It is surrounded by a 16-acre (6.5 ha) garden and estate of 60,000 acres (24,000 ha). Besides welcoming visitors to the castle, the estate's activities include commercial forestry, tenanted farming, wind and hydro power and (deer) hunting.
In 2012, the Christmas episode of Downton Abbey was partly filmed here; the castle stood in for the fictional "Duneagle Castle". Inveraray Castle also featured in a series on Scottish castles made by American broadcaster PBS. The "Best of the West" festival, organized by the Duchess, is held at the castle each September.