In Norse mythology, Máni (Old Norse/Icelandic "moon") is the moon personified. Máni, personified, is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda, written in the 13th century by Snorri Sturluson. Both sources state that he is the brother of the personified sun, Sól, and the son of Mundilfari, while the Prose Edda adds that he is followed by the children Hjúki and Bil through the heavens. As a proper noun, Máni appears throughout Old Norse literature. Scholarly theories have been proposed about Máni's potential connection to the Northern European notion of the Man in the Moon, and a potentially otherwise unattested story regarding Máni through skaldic kennings.

In the poem Völuspá, a dead völva recounts the history of the universe and foretells the future to the disguised god Odin. In doing so, the völva recounts the early days of the universe:

In stanza 23 of the poem Vafþrúðnismál, the god Odin (disguised as "Gagnráðr") tasks the jötunn Vafþrúðnir with a question about the origins of the sun and the moon, whom he describes as journeying over mankind. Vafþrúðnir responds that Mundilfari is the father of both Sól and Máni, and that they must pass through the heavens every day to count the years for mankind: