Sigrid the Haughty, Gunhilda, Sigrid Storråda, (c957 – 1014) was a mystic character who appears in many sagas and historical chronicles. It is not known whether she was a real person or a compound person (with several real women's lives and deeds were attributed to one).

In 980 (possibly 985) she married Eric VI of Sweden. She may have given birth to Olof Skötkonung who later became king of Sweden, but some doubt that.

After 994 she married Sweyn I of Denmark under the name Gunhilda. From this second marriage she probably had five children, including Canute the Great and Harold II of Denmark.

Thietmar mentions that the daughter of Mieszko I of Poland and sister of Boleslaw I of Poland married Sweyn I of Denmark and gave him two sons, Canute the Great and Harold II of Denmark, but he does not mention her name. He is probably the best informed of all medieval chroniclers, since he was contemporary with described events and well-informed about the events in Poland and Denmark. Moreover, the fact that Canute's mother was Boleslaw's sister may explain some mysterious facts which appear in medieval chronicles, such as the involvement of Polish troops in invasions of England.