Máel Dúin (died 1055) is the eighth alleged Bishop of St Andrews (or Cennrígmonaid). He is mentioned in the bishop-lists of the 15th-century historians Walter Bower and Andrew of Wyntoun as the successor of Bishop Ailín.^[1]

Máel Dúin is known from other sources. A charter preserved in the Registrum of the Priory of St. Andrews, although probably translated into Latin from Gaelic at a later date,^[2] records a grant of the lands and church of Markinch by Bishop Máel Dúin (Maldunus) of St. Andrews to the Céli Dé of Loch Leven.^[3]

Máel Dúin is also recorded in the Irish annals. His obituary is noted in the Annals of Tigernach under the year 1055, when it records "Mael Duín mac Gilla Odran, espoc Alban & ordan Gaedel o cleircib, in Christo quieuit"^[4] that is, in English, "Mael Duín, Gille Odran's son, bishop of Scotland and glory of the Gaels from [their] priests, reposed in Christ".^[5] Bower calls him "filius Gillandris", suggesting that he was the son of a man called Gille Andréis; it is not clear whether Gille Andréis and Gille Odrain are versions of the same name, or if Bower and The Annals of Tigernach are contradicting each other.

Máel Dúin was succeeded in the bishopric by Túathal.

• Anderson, Alan Orr, Early Sources of Scottish History: AD 500–1286, 2 Vols, (Edinburgh, 1922), vol. i
• Bannerman, John, "MacDuff of Fife," in A. Grant & K.Stringer (eds.) Medieval Scotland: Crown, Lordship and Community, Essays Presented to G.W.S. Barrow, (Edinburgh, 1993), pp. 20–38
• Jackson, Kenneth H. (ed), The Gaelic Notes in the Book of Deer: The Osborn Bergin Memorial Lecture 1970, (Cambridge (1972)
• Lawrie, Sir Archibald, Early Scottish Charters Prior to A.D. 1153, (Glasgow, 1905)
• MacQueen, John, MacQueen, Winifred & Watt, D.E.R. (eds.), Scottichronicon by Walter Bower in Latin and English, Vol. 3, (Aberdeen, 1995)

v t e Bishops and archbishops of St Andrews
Known pre-Norman era bishops	Cellach I Fothad I Máel Ísu I Cellach II Máel Muire Máel Ísu II Ailín Máel Dúin Túathal Fothad II Giric Cathróe
Scoto-Norman era bishops	Turgot of Durham Eadmer Robert of Scone Ernald Richard the Chaplain Hugh the Chaplain John Scotus Roger de Beaumont Geoffrey de Liberatione William de Malveisin David de Bernham Robert de Stuteville Abel de Gullane Gamelin William Wishart William Fraser William de Lamberton James Bane William Bell William de Landallis Stephen de Pa Walter Trail Thomas Stewart Walter de Danielston Gilbert de Greenlaw Henry Wardlaw James Kennedy Patrick Graham
Pre-Reformation archbishops	Patrick Graham William Scheves James Stewart, Duke of Ross Alexander Stewart John Hepburn Cardinal Innocenzo Cybo Andrew Forman James Beaton Cardinal David Beaton John Hamilton Gavin Hamilton
Post-Reformation archbishops	John Douglas Patrick Adamson George Gledstanes John Spottiswoode James Sharp Alexander Burnet Arthur Rose
Afterwards, see also: Episcopal Archbishops of St Andrews, Bishops of St Andrews, Dunkeld and Dunblane (etc.) & Roman Catholic Archbishops of St Andrews and Edinburgh (etc.)