Mimir, in Norse mythology, giant who guarded the well of wisdom. According to one legend Mimir was beheaded by the enemies of the gods of Asgard; his head was then preserved by Odin, who consulted it for information and advice.

In Norse mythology, the wisest of the gods of the tribe Aesir. He was also believed to be a water spirit. Mimir was sent by the Aesir as a hostage to the rival gods (the Vanir), but he was decapitated and his head was returned to the Aesir. Odin preserved the head in herbs and gained knowledge from it. Other tales claim that Mimir lived by a well beneath the roots of Yggdrasill, the world tree, and that he was a smith who taught the hero Siegfried his craft.

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Mimir can refer to:

• Mímir, a primal god of Norse mythology
• Mimir (Regin in other sources), the name of the Sigurd's foster father in the Thidrekssaga. He is the basis for Mime in Wagner's Ring cycle.
• Mimir, a magical construct that is created to provide information to players in the Dungeons & Dragons Planescape setting. They are usually a silvery, metallic, disembodied skull (the name and concept is derived from Norse god).
• Mimir (band), a textural music project of the members of The Legendary Pink Dots and Christoph Heemann.