In Norse mythology, Gríðr (Old Norse ”frantic eagerness; greed, vehemence, violence, impetuosity”) is a female jötunn who is the mother of the god Víðarr by Oðinn.
Gríðr is mentioned in the poem Þórsdrápa and in Snorri Sturluson's Skáldskaparmál. A witch of the same name appears in Illuga saga Gríðarfóstra.
Saxo Grammaticus refers to her as Grytha, the wife of the legendary king Dan I of Denmark, "a matron most highly revered among the Teutons".