In Norse Mythology, Freyr (Frey) is the god of the sun, rain, and weather and the patron of bountiful harvests. He is the son of Njord, step-son of Skadi, sister of Freya (Freyja), and husband of Gerd (Gymir). Freyr rides a chariot pulled by the boars Gullinbursti ("golden-bristled") and Slidrugtanni, made by the dwarf brothers Brokk and Sindre for Loki to give to Freyr. Sometimes he also rides Gullinbursti alone through the sky. Also thanks to Loki, the sons of Ivalde made him the ship Skidbladnir ("wooden-bladed"), which sails through the sky directly towards it's target. Even though it is capable of holding all of the gods, it can shrink small enough for Freyr to keep it in a pocket. Another notable possession was a sword that can remove itself from its home and cover a field with bodies when its owner asked for it or "swings itself if wise he who wields it".

Freyr gave his servant and shield bearer, Skirnir, the sword in return for winning Gerd for him as his wife. He had fallen in love with Gerd, a beautiful giantess, when he saw her from Odin's throne and sent Skirnir off with his horse and sword to win her for him. Despite Skirnir's best attempts at flattery and the presentation of gifts such as golden apples, he only succeeded after threatening her with the use of Freyr's sword to cover the world in a sheet of ice. After the additional threat of using magic to condemn Gerd to eternal misery, she agreed to arrange a meeting nine days later with Freyr in a wood and then married him.

Like his father, Freyr was originally a member of the Vanir. When they and the Aesir made peace he went to them along with Njord and Freya. He and Njord were appointed a high priests to oversee sacrifices.

At Ragnarok Freyr will fight without any weapons since he had given his sword away and will be the first killed by Surt, the fire demon.

The name Freyr means "Lord" and it is thought that he could have been the consort of his sister Freya ("Lady"). He is also known as Yng, Frey, Fricco, and Yngvi and city where he was worshiped most was Uppsala, Sweden where there is a statue of him in the temple. As Yng, he is the progenitor of the Swedish royal family. Other areas of dedication were Iceland and Norway and along with his sister they are popular in the lays of the former. Boars were the animal of choice for sacrifice to the siblings.