In Norse mythology, Muspelheim (Old Norse: Múspellsheimr), also called Muspell (Old Norse: Múspell), is a realm of fire. This realm is one of the Nine Worlds, ruled by Surtr with his consort Sinmara in some accounts. The denizens of Muspelheim were usually referred to as the Eldjötnar (or Eldthursar, Eldþursar — "fire giants") in Norse tradition, though they were also identified by other epithets in Eddic poetry, such as the Múspellssynir (or Múspellsmegir — "sons of Muspell"; altn. Múspellmegir, Múspellsynir) and the Rjúfendr (from rjúfa — "to break, tear asunder", Destroyers of Doomsday). Both of these terms sometimes described an entirely separate mythological species that dwelled alongside or in place of the eldjötnar within this fiery realm. Muspelheim is fire; and the land to the North, Niflheim, is ice. The two mixed and created water from the melting ice in Ginnungagap. The sun and the stars originate from Muspelheim.
In the midst of this clash and din the heavens are rent in twain, and the sons of Muspell come riding through the opening. Surtr rides first, and before him and after him flames burning fire. He has a very good sword, which shines brighter than the sun. As they ride over Bifrost it breaks to pieces, as has before been stated. The sons of Muspel direct their course to the plain which is called Vigrid.... The sons of Muspel have there effulgent bands alone by themselves.
In popular culture
- The realm of Muspelheim appears as 'Muspel' in Gene Wolfe's book series, The Wizard Knight. It is inhabited by the dragon 'Setr', as a close parallel to Surtr.
- "Muspel" is the name of a German colony in Africa in the alternate-reality novel The Afrika Reich by Guy Saville.
- Muspelheim is the name of a reoccurring boss ship in the Naval Ops: Warship Gunner series.
- In the Marvel Universe, Muspelheim is the home of Surtur, who is based on Surtr. A glimpse of Muspelheim is seen in the Marvel Studios film Thor: The Dark World. In the sequel Thor: Ragnarok, Thor travels to Muspelheim to battle Surtur, in an attempt to prevent Ragnarok.
- Múspelheim appears in the science fiction novel Resonance: Ragnarok: Volume Three (Kindle Location 3488) by John Meaney
- Muspelheim is mentioned in the anime Sword Art Online II during a quest taking place in Jötunheim. Yui - an AI in the show - expresses her concern that even if they complete the quest and defeat Þrymr, the flame giants of Muspelheim will take over Alfheim by burning down Yggdrasil.
- In the Video Game Valkyrie Profile, Muspelheim is mentioned within the incantations that compose the great Magic "Ifreet Caress": "I invoke the rites of fiery Muspelheim, now give up thy soul to inferno's embrace! Ifreet Caress!"
- In the videogame La Mulana 2, Múspelheim (spelled "Muspellheim") is an area within the ruins Eg'Lana and is known as the "Blazing Frost Canopy", a land that's both frozen and on fire. This technically makes it both Múspelheim and Niflheim in one.
- In the Japanese light novel Mahouka Koukou no Rettousei, Muspelheim is the name of a magic spell that creates a field where immense heat, capable of creating plasma, is generated.
- In the Amon Amarth song "Destroyer of the Universe" from the album Surtur Rising, Muspelheim is mentioned in the first verse.
- In the Unleashed song "The Bolt Thrower" the title character in the song was "Forged in the fires of Muspelheim."
- In the video game Bayonetta 2 Muspelheim serves as the location of challenge rooms within portals found throughout levels, however the realm is not represented like it is described in Norse Mythology but instead like the typical depictions of Judeo-Christian "Heaven" and "Hell".
- In Heroine's Quest, Muspell (actually eldjötnar) appear as enemies.
- Múspellsheimr also gives its name to "Muspel," a place in David Lindsay's A Voyage to Arcturus.
- A zone in the game Dark Age of Camelot. "Home of the Fire Giants and numerous other fire based critters" 
- There is a dungeon raid in the MMO Marvel Heroes which takes place in Muspelheim.
- In the video game Fire Emblem Heroes, Askr is at one point attacked by the kingdom of Muspell, led by King Surtr.
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- "Court poetry, vol. I.", pg. 183; "Court poetry, vol. II", pg. 472, s.v. "Demon World-Destroyers"
- Germanic Lexicon Project: http://lexicon.ff.cuni.cz/html/oi_cleasbyvigfusson/b0501.html
- "Muspelheim | Norse mythology". Encyclopedia Britannica. Retrieved 2017-08-12.
- Tilton, Theodore (1897). The complete poetical works of Theodore Tilton in one volume: with a preface on ballad-making and an appendix on old Norse myths & fables. London: T. Fisher Unwin. p. 705. Retrieved 2013-01-05.
- Vigfússon, Guðbrandur; Frederick York Powell (1883). Corpus poeticum boreale: Court poetry, vol. II. Oxford: Clarendon Press. p. 471. Retrieved 2013-01-05.