Moy Castle is a ruined castle near Lochbuie on the Isle of Mull and was used for scenes in Powell and Pressburger's 1945 film 'I Know Where I'm Going!', along with other locations on Mull.
The castle is now a scheduled monument and comprises a three-storey tower house with a garret. Much of the surviving stonework can be dated to the early 15th century; some alterations and additions can be attributed to the end of the following century. Although missing its roof, the castle's walls are virtually intact up to the height of the gables and parapet.