In Norse mythology, Heimdallr (modern Icelandic Heimdallur) is a god who possesses the resounding horn Gjallarhorn, owns the golden-maned horse Gulltoppr, has gold teeth, and is the son of Nine Mothers. Heimdallr is attested as possessing foreknowledge, keen eyesight and hearing, and is described as "the whitest of the gods", and keeps watch for the onset of Ragnarök while drinking fine mead in his dwelling Himinbjörg, located where the burning rainbow bridge Bifröst meets Asgard, the world of the gods.

Heimdallr is said to be the originator of social classes among humanity and once regained Freyja's treasured possession Brísingamen while doing battle in the shape of a seal with Loki. Heimdallr and Loki are foretold to kill one another during the events of Ragnarök. Heimdallr is additionally referred to as Rig, Hallinskiði, Gullintanni, and Vindlér or Vindhlér.

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Fast move the sons of Mim and fate Is heard in the note of the Gjallarhorn; Loud blows Heimdall, the horn is aloft, In fear quake all who on Hel-roads are.

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She knows that Heimdall's horn is hidden under the heaven-bright holy tree. A river she sees flow, with foamy fall, from Valfather's pledge. Understand ye yet, or what?