| Margareta Hasbjörnsdatter | |
| Queen consort of Denmark | |
| Reign: | 1076–1080 |
| Spouse: | Harald III of Denmark |
| Father: | Asbjörn Ulfsen |
| Birth Date: | unknown (before 1076) |
| Death Date: | unknown (after 1080) |
| Burial Place: | Roskilde Cathedral |
Margareta Hasbjörnsdatter or Margareta Asbjørnsdatter (11th century) was Queen consort of Denmark as the spouse of King Harald III.
Margareta was the daughter of jarl Asbjörn Ulfsen, possibly an uncle of her spouse; she would thereby have been her husband's cousin. No children are known from the marriage. The dates of her birth and death are unknown.
A DNA test in 2003 dispelled the centuries-old legend that Estrid Svendsdatter was buried in the northeastern pier of the Roskilde Cathedral. The new theory is that the sign on the pier refers to Margareta Hasbjörnsdatter, who was also known as Estrid.[1]