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".
Kisimul Castle is a small castle for Scotland but a large castle relative to other European castles.