Guthorm or Guthormus was one of the earliest legendary Danish kings according to Saxo Grammaticus. He was a son of the Danes king, Gram, and a Swedes princess, Groa.
| GUTHORM and HADDING, the son of Gram (Groa being the mother of the first and Signe of the second), were sent over to Sweden in a ship by their foster-father, Brage (Swipdag being now master of Denmark), and put in charge of the giants Wagnhofde and Hafle, for guard as well as rearing. |
| Swipdag, now that he had slain Gram, was enriched with the realms of Denmark and Sweden; and because of the frequent importunities of his wife he brought back from banishment her brother Guthorm, upon his promising tribute, and made him ruler of the Danes. But Hadding preferred to avenge his father rather than take a boon from his foe. |
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