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Domhnall mac Raghnaill was a Hebridean chief from the late 12th- and early 13th-century. He is the eponymous progenitor of Clan Donald (Clann Dhòmhnaill, "Children of Donald"). For this reason some traditions accumulated around him in the Later Middle Ages and Early Modern period. Despite his role as the historical figurehead of one of the world's most famous kindreds and surnames, there is almost no contemporary evidence yielding certain information about his life.
His place in the genealogical tradition of the MacDonalds is the only reason for believing in his existence, a genealogical tradition that all historians have accepted. Beyond his actual existence, there is little that is certain. Three entries in Irish annals may discuss him, though he is never named; a praise poem surviving from the Early Modern period may be descended from a poem originally written for him; a miracle in a Manx chronicle may or may not have Domhnall as its subject; and a doubtful charter surviving from a similarly late era was allegedly issued by him. Domhnall was, reputedly, the son of Raghnall (fl. 1192) son of Somhairle (died 1164). The 17th-century History of the Macdonalds by Hugh MacDonald of Sleat claimed that Domhnall's father Raghnall had married a daughter or sister of the early 14th-century hero Thomas Randolph, Earl of Moray. Sellar suggested that this tradition may have derived from a garbled version of reality. Perhaps, Sellar argued, his mother was a daughter of William fitz Duncan. The latter was another famous Earl of Moray, but one who lived in the 12th- rather than the 14th-century.