In Norse mythology, Gerðr (Old Norse "fenced-in") is a jötunn, goddess, and the wife of the god Freyr. Gerðr is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources; the Prose Edda and Heimskringla, written in the 13th century by Snorri Sturluson; and in the poetry of skalds. Gerðr is sometimes modernly anglicized as Gerd or Gerth.

In both the Poetic Edda and the Prose Edda, Freyr sees Gerðr from a distance, becomes deeply lovesick at the sight of her shimmering beauty, and has his servant Skírnir go to Jötunheimr (where Gerðr and her father Gymir reside) to gain her love. In the Poetic Edda Gerðr initially refuses, yet after a series of threats by Skírnir she finally agrees. In the Prose Edda, no mention of threats is made. In both sources, Gerðr agrees to meet Freyr at a fixed time at the location of Barri and, after Skírnir returns with Gerðr's response, Freyr laments that the meeting could not occur sooner. In both the Poetic Edda and the Prose Edda, Gerðr is described as the daughter of Gymir and the mountain jötunn Aurboða.