Gefjon (Old Norse: Gefjon, also Gefjun) is a goddess associated with agriculture, plowing, and fate. Her most prominent mythological episode is the creation of the island of Zealand (Sjáland): Gylfaginning recounts that the Swedish king Gylfi promised Gefjon as much land as she could plow in one day and night; she transformed her four giant sons into oxen and plowed out a large tract of Swedish land, which became Zealand, leaving the lake Mälaren behind as the void. A version of this story is referenced in Lokasenna (st. 20), and a stanza is attributed to the skald Bragi inn gamli in Skáldskaparmál.
Snorri states in Gylfaginning that Gefjon is a virgin and that all women who die as virgins become her servants in the afterlife — a statement that stands in tension with the Lokasenna passage where Loki accuses her of sexual impropriety. She is listed in Gylfaginning among the Ásynjur and said to know men’s fate as well as Odin does.
Saxo Grammaticus mentions a place called Gefjunarlundr (Gefjon’s grove) in a Danish context, implying a sacred site.