Eochaid Iarlaithe mac Lurgain (died 666) was a Dal nAraide king of the Cruithne in Ulaid (Ulster). He was the son of Fiachnae mac Báetáin (died 626) a king of all Ulaid and possible high king. He belonged to the main ruling dynasty of the Dal nAraide known as the Uí Chóelbad based in Mag Line, east of Antrim town in modern county Antrim. Eochaid's son Lethlobar mac Echach (died 709) was also a king of Dal nAraide.