Amlaíb mac Illuilb (died 977) was a tenth-century King of Alba. He was one of three sons of Illulb mac Custantín, King of Alba, and a member of Clann Áeda meic Cináeda, a branch of the Alpínid dynasty. Amlaíb's paternal grandfather possessed strong connections with the Scandinavian dynasty of Dublin, and there is evidence to suggest that Illulb and Amlaíb bore names of Old Norse origin. If Amlaíb's name indeed represents a Gaelicised Scandinavian name, it could indicate that his mother was a member of the Uí Ímair, and possibly a granddaughter of Amlaíb Cúarán or Amlaíb mac Gofraid.