Astrid Njalsdotter (or Ástríðr Njálsdóttir) of Skjalgaätten (also Aestrith) (11th century), was a Norwegian noblewoman who married Ragnvald the Old and became the ancestress of the Swedish Stenkil dynasty (c. 1060 – c. 1125). She is sometimes assumed to have been a Swedish queen, though the evidence is inconclusive.