Norse Mythical Creatures – 12 Legendary Beings

Discover 12 mythical creatures from Norse mythology, from the immense wolf Fenrir and the World Serpent Jörmungandr to Odin's eight-legged horse Sleipnir and the dragon Níðhöggr. These beings appear in medieval Icelandic sources that preserve stories associated with pre-Christian Scandinavia.

Looking for the gods behind these stories? Visit our Thor, Odin & Loki guide. You can also browse FOSMORE's Mythical Guides PDF collection.

Norse mythical creatures at a glance

12 famous creatures and their stories

1. Fenrir – the monstrous wolf

Also called: Fenrisúlfr (Fenris Wolf). Fenrir is the huge wolf born to Loki and the giantess Angrboða. The gods bind him with the extraordinary fetter Gleipnir, but he is destined to break loose at Ragnarök. In a well-known account, he devours Odin before being killed by Odin's son Víðarr.

2. Jörmungandr – the World Serpent

Also called: Miðgarðsormr (Midgard Serpent). Another child of Loki and Angrboða, Jörmungandr is cast into the sea and grows so vast that it surrounds Midgard. Thor encounters the serpent during a fishing expedition; at Ragnarök they kill one another, with Thor succumbing to its venom.

3. Sleipnir – Odin's eight-legged horse

Sleipnir is a remarkable grey horse with eight legs, celebrated as Odin's mount. In a famous story involving the building of Asgard's wall, Loki assumes the form of a mare and later gives birth to Sleipnir. The horse can carry Odin on extraordinary journeys, including one to the realm of the dead.

4. Níðhöggr – the being beneath Yggdrasil

Also written: Nidhogg or Níðhǫggr. This menacing serpent or dragon-like creature is associated with the roots of the world tree Yggdrasil and, in some sources, with corpses. Its presence reflects the threats and tensions woven into Norse cosmology.

5. Ratatoskr – the messenger squirrel

Ratatoskr races along Yggdrasil, carrying spiteful words between the eagle high in its branches and Níðhöggr below. Though far smaller than the dragons and wolves of Norse legend, this squirrel has a distinctive place in the world tree's mythology.

6. Sköll – the pursuing wolf

Sköll is associated with pursuit of the sun across the sky. The details surrounding Sköll and other celestial wolves vary across the surviving Old Norse texts; modern summaries often present him as the wolf chasing Sól, the sun.

7. Hati – the moon-chasing wolf

Also called: Hati Hróðvitnisson. Hati is often described as the wolf pursuing Máni, the moon. Alongside Sköll, he forms part of the imagery of wolves hunting celestial bodies, although source traditions are not perfectly uniform.

8. Garmr – the hound at Gnipahellir

Also written: Garm. Garmr is a fierce hound associated with the cave Gnipahellir and the approach of Ragnarök. The Prose Edda connects him with a final fight against the god Týr. Scholars debate whether descriptions of Garmr and Fenrir sometimes overlap.

9. Fáfnir – the treasure-guarding dragon

Also written: Fafnir. Fáfnir is a figure from the heroic Sigurd tradition, closely related to Norse mythological literature. Once a humanoid being, he becomes a serpent or dragon while guarding a cursed treasure. Sigurd defeats him and later gains knowledge through the dragon's blood in the legend.

10. Huginn and Muninn – Odin's ravens

Name meanings: often translated as “Thought” and “Memory” or “Mind.” Odin's two ravens travel widely and return with news. They are a memorable pair of mythic animals associated with the god's search for knowledge and awareness.

11. Heiðrún – the goat of Valhalla

Also written: Heidrun. Heiðrún feeds on the foliage of the tree associated with Valhalla and produces the drink enjoyed by the slain warriors who dwell there. She represents a less frightening but equally unusual aspect of the Norse otherworld.

12. Eikþyrnir – the stag above Valhalla

Also written: Eikthyrnir. This mythical stag stands on Valhalla and feeds from the same legendary tree as Heiðrún. Moisture from its antlers is linked in the Poetic Edda with the well Hvergelmir and the flowing waters of the mythic world.

Norse creatures and Ragnarök

Ragnarök is the series of catastrophic events in which several gods and monsters meet their fates. Fenrir breaks free and kills Odin; Jörmungandr fights Thor; and Garmr is associated with the final conflict. Not every Norse creature participates in Ragnarök. Sleipnir, Ratatoskr and Odin's ravens have different roles in the surviving legends.

Where do these stories come from?

Much of what we know comes from the Poetic Edda, a collection of Old Norse poems, and the Prose Edda, written by Snorri Sturluson in medieval Iceland. The heroic story of Fáfnir is also preserved in the Sigurd tradition. These written sources postdate much of the earlier belief and storytelling, so details may vary between texts and translations.

Frequently asked questions

What is the most famous creature in Norse mythology?

Fenrir and Jörmungandr are among the best-known because of their roles in Ragnarök. Sleipnir is also widely recognised.

Is Fenrir Loki's son?

Yes. In the Prose Edda, Fenrir is the child of Loki and Angrboða, alongside Jörmungandr and Hel.

Is Jörmungandr a dragon or a serpent?

Jörmungandr is generally described as an immense serpent. Some modern retellings use the broader term dragon, but “World Serpent” is more precise.

What creature does Thor fight?

Thor's most famous monstrous opponent is Jörmungandr, the Midgard Serpent.

Is Fáfnir from Norse mythology?

Fáfnir appears in Old Norse heroic legend, especially narratives about Sigurd. He is part of the wider Norse literary tradition, though not one of the central gods.

Are Norse giants always huge?

No. The Old Norse jötnar are a varied category of beings and are not always depicted as physically gigantic.

Are all Norse creatures evil?

No. Norse stories include threatening monsters, helpful animals, extraordinary companions and morally ambiguous beings. Their roles differ by story.

Explore related mythology guides

• Thor, Odin & Loki – Norse Gods and Legends
• Egyptian Mythical Creatures
• Roman Mythical Creatures
• Japanese Mythical Creatures
• FOSMORE Mythical Guides – Downloadable PDFs

Further reading

• Encyclopaedia Britannica – Norse Mythology
• Poetic Edda – Historical English Translation
• Prose Edda – Historical English Translation

Information note

This guide summarises traditional stories for general educational purposes. Norse narratives survive in different versions and translations; mythological descriptions should not be treated as established historical events. FOSMORE is not affiliated with the external reference providers, and their content remains their own.