A king who appears in the lays of Sigurðr. His wife is Grímhildr and their children are Gunnarr, Högni, and Guðrún. In Guðrúnarkviða I, their second daughter is named Gullrönd while in Skáldskaparmál she is called Guðný. Gjúki's son by another woman is Guthormr. With the death of his grandsons Erpr, Sörli and Hamðir the line of Gjúki came to an end.
In Hyndluljóð, Ottr is mentioned as being of the race of Gjúki.
- Guðrúnarkviða I, 12.
- Hyndluljóð, 27.
- Skáldskaparmál, 41.