Fiachnae mac Báetáin (died 626), also called Fiachnae Lurgan or Fiachnae Find, was king of the Dál nAraidi and High King of the Ulaid in the early 7th century. He was a son of Báetán mac Echdach and brother of Fiachra Cáech (died c. 608), grandson of the Ulaid king Eochaid mac Condlai (died 552) and father of Mongán mac Fiachnai.