In Norse mythology, Eir (Old Norse "help, mercy") is a goddess and/or valkyrie associated with medical skill. Eir is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources; the Prose Edda, written in the 13th century by Snorri Sturluson; and in skaldic poetry, including a runic inscription from Bergen, Norway from around 1300. Scholars have theorized about whether these three sources refer to the same figure, and debate whether Eir may have been originally a healing goddess and/or a valkyrie. In addition, Eir has been theorized as a form of the goddess Frigg and has been compared to the Greek goddess Hygieia.
In the Poetic Edda poem Fjölsvinnsmál, the watchman Fjölsviðr presents a list of the maidens that attend the lady of the keep—Menglöð—that includes Eir, and states that they all sit on the hill Lyfjaberg (Old Norse "hill of healing" or "healing mountain"). The exchange between the hero Svipdagr and Fjölsviðr mentioning Eir is as follows:
After the exchange, Svipdagr asks if these figures will give aid if blóts are made to them. Fjölsviðr responds that Svipdagr is correct:
In chapter 35 of the Prose Edda book Gylfaginning, the enthroned figure of High provides brief descriptions of 16 ásynjur. High lists Eir third, and says no more about her other than noting that "she is an extremely good physician." In chapter 75 of the Prose Edda book Skáldskaparmál Eir appears within a list of valkyrie names, but Eir is not included in the list of ásynjur in the same chapter.