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.

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