Máel Dúin

Máel Dúin may refer to:
 * the protagonist of The Voyage of Máel Dúin (Old Irish: Immram Maele Dúin).
 * Máel Dúin mac Áedo Bennán (died c.661), king of Iarmuman (West Munster)
 * Máel Dúin mac Conaill (died c.668), king in Dál Riata
 * Máel Dúin mac Máele Fithrich (died 681), king of Ailech
 * Máel Dúin mac Fergusa (died 785), king of Lagore
 * Máel Dúin mac Áedo Alláin (died 788), king of Ailech
 * Máel Dúin mac Áedo (died 796), perhaps king of Munster
 * Máel Dúin (bishop of the Scots) (died 1055), bishop of Cennrígmonaid, modern St Andrews, Scotland