In Norse mythology, Hymir was a giant, a husband of Hrod. He owned a cauldron which the Aesir wanted to brew beer in. Thor obtained it from him.

He is mentioned in a poem titled the Hymiskviða, in the Codex Regius between the Hárbarðsljóð and the Lokasenna. Hymir is the owner of a cauldron large enough to hold the Aesir's mead. His skull is unusually hard, and Thor breaks a cup by throwing it at Hymir's head.

During Ragnarok, Hymir will sail Naglfar, a boat made of the nails of the dead and freed by the preceding flood. Hymir will bring an army of giants to the battlefield, Vigrond.

Tyr was sometimes considered a son of Hymir.