Eoghan mac Diarmait Ó Máille
Eoghan mac Diarmait Ó Máille was a fourteenth-century member of the Ó Máille family, son of Diarmait and nephew of Domnall Ruadh Ó Máille, King of Umaill.
After his uncle and cousin Cormac were killed in the Burke Civil War in 1337, Eoghan's branch displaced the descendants of Domnall Ruadh. He had twelve recorded sons, among them Diarmait and Domnall, and every later chief of Umaill traced descent from him.