In Norse paganism, Freyja (Old Norse "(the) Lady") is a goddess associated with love, beauty, fertility, sex, war, gold, and seiðr (magic for seeing and influencing the future). Freyja is the owner of the necklace Brísingamen, rides a chariot pulled by two cats, is accompanied by the boar Hildisvíni, and possesses a cloak of falcon feathers. By her husband Óðr, she is the mother of two daughters, Hnoss and Gersemi. Along with her twin brother Freyr, her father Njörðr, and her mother (Njörðr's sister, unnamed in sources), she is a member of the Vanir. Stemming from Old Norse Freyja, modern forms of the name include Freya, Freyia, and Freja.

Freyja rules over her heavenly field, Fólkvangr, where she receives half of those who die in battle. The other half go to the god Odin's hall, Valhalla. Within Fólkvangr lies her hall, Sessrúmnir. Freyja assists other deities by allowing them to use her feathered cloak, is invoked in matters of fertility and love, and is frequently sought after by powerful jötnar who wish to make her their wife. Freyja's husband, the god Óðr, is frequently absent. She cries tears of red gold for him, and searches for him under assumed names. Freyja has numerous names, including Gefn, Hörn, Mardöll, Sýr, Vanadís, and Valfreyja.

Freyja is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources; in the Prose Edda and Heimskringla, composed by Snorri Sturluson in the 13th century; in several Sagas of Icelanders; in the short story "Sörla þáttr"; in the poetry of skalds; and into the modern age in Scandinavian folklore.

Scholars have debated whether Freyja and the goddess Frigg ultimately stem from a single goddess common among the Germanic peoples. They have connected her to the valkyries, female battlefield choosers of the slain, and analyzed her relation to other goddesses and figures in Germanic mythology, including the thrice-burnt and thrice-reborn Gullveig/Heiðr, the goddesses Gefjon, Skaði, Þorgerðr Hölgabrúðr and Irpa, Menglöð, and the 1st century CE "Isis" of the Suebi. In Scandinavia, Freyja's name frequently appears in the names of plants, especially in southern Sweden. Various plants in Scandinavia once bore her name, but it was replaced with the name of the Virgin Mary during the process of Christianization. Rural Scandinavians continued to acknowledge Freyja as a supernatural figure into the 19th century, and Freyja has inspired various works of art.