Halga, Helgi, Helghe or Helgo was a legendary Danish king living in the early 6th century. His name would in his own language (Proto-Norse) have been *Hailaga (dedicated to the gods).
Scholars generally agree that he appears in both Anglo-Saxon (Beowulf) and Scandinavian tradition (Norse sagas and Danish chronicles). In both traditions, he was a Scylding, the son of Healfdene and the brother of Hroðgar. In Beowulf, his relationship to Hroðulf is not explained, but if he was not his father, as in the Scandinavian tradition, he was at least his uncle. Both traditions also mention his family's feud with Froda and Ingeld.