Kisimul Castle (Scottish Gaelic: "Caisteal Chiosmuil" ) and also known as Kiessimul Castle, is a small medieval castle located on a small island off Castlebay, Barra, in the Outer Hebrides, Scotland. It gets its name from the Gaelic "cìosamul" meaning "castle island".
Since its construction, Kisimul Castle has never been attacked by an invading army. 