Máel Coluim mac Donnchada (called in most Anglicized regnal lists Malcolm III, and in later centuries nicknamed Canmore, "Big Head", either literally or in reference to his leadership, "Long-neck"; died 13 November 1093), is King of Scots.

He is the eldest son of King Duncan I (Donnchad mac Crínáin).

Malcolm's long reign, lasting 35 years, precedes the beginning of the Scoto-Norman age.

He is the historical equivalent of the character of the same name in Shakespeare's Macbeth.

Malcolm's Kingdom does not extend over the full territory of modern Scotland: the north and west of Scotland remain in Scandinavian, Norse-Gael and Gaelic control, and the areas under the control of the Kings of Scots do not advance much beyond the limits set by Malcolm II (Máel Coluim mac Cináeda) until the 12th century.

Malcolm III fights a succession of wars against the Kingdom of England, which may have had as their goal the conquest of the English earldom of Northumbria.

These wars do not result in any significant advances southwards.

Malcolm's main achievement is to have continued a line which will rule Scotland for many years, although his role as "founder of a dynasty" has more to do with the propaganda of his youngest son David, and his descendants, than with any historical reality.

Malcolm's second wife, Margaret of Wessex, is later beatified and is Scotland's only royal saint.

Malcolm himself gains no reputation for piety; with the notable exception of Dunfermline Abbey he is not definitely associated with major religious establishments or ecclesiastical reforms.