Coll Ciotach Mac Domhnaill (English: Left-handed Coll MacDonald) (1570–1647) was a Scottish adventurer and mercenary of the Clan MacDonald of Dunnyveg branch of Clan Donald, who became Laird of Colonsay in 1623, by treachery. His name, which means "Coll the left-handed" or "the crafty", was anglicised as Colkitto. However he only used the nickname Ciotach late in his life in 1629 when it appeared in a Latin translation of a Gaelic letter where Coll refers to himself as "Ego Collatius Kiotach Macdonnell".