In Germanic heroic legend and folklore, Fáfnir is a worm or dragon slain by a member of the Völsung family, typically Sigurð.

In Nordic mythology, he is the son of Hreiðmarr, and brother of Regin and Ótr and is attested throughout the Völsung Cycle, where, Fáfnir slays his father out of greed, taking the ring and hoard of the dwarf Andvari and becoming a worm or dragon. Fáfnir's brother Regin later assisted Sigurð in obtaining the sword Gram, by which Fáfnir is killed.

He has been identified with an unnamed dragon killed by a Völsung in other Germanic works including Beowulf, the Nibelunglied and a number of skaldic poems. Fáfnir and his killing by Sigurð are further represented in numerous medieval carvings from the British Isles and Scandinavia, and a single axe head in a Scandinavian style found in Russia.

Fáfnir appears with the spelling "Fafner" in Richard Wagner's epic opera cycle Der Ring des Nibelungen (1848–1874), although he began life as a giant rather than a dwarf. In the first opera, Das Rheingold (1869), which has some basis in Gylfaginning, Fafner and his brother Fasolt try to kidnap the goddess Freia, a composite of the goddesses Freyja and Iðunn, who has been promised to them by Wotan, the king of the gods, in exchange for building the castle Valhalla. Fasolt is in love with her while Fafner wants her as without her golden apples the gods will lose their youth.

The giants, mainly Fafner, agree to accept a massive hoard of treasure stolen from the dwarf Alberich instead. The treasure includes the magic helmet Tarnhelm and a magic ring. As they divide the treasure, the brothers argue and Fafner kills Fasolt and takes the ring for himself. Escaping to Earth, he uses the Tarnhelm to transform himself into a dragon and guards the treasure in a cave for many years before being ultimately killed by Wotan's mortal grandson Siegfried as depicted in the opera of the same name. However, while Fasolt is a romantic revolutionary, Fafner is a more violent and jealous figure, plotting to overthrow the gods. In many productions, he is shown to return to his original giant form while delivering his death-speech to Siegfried.

All published appearances of Fafnir  from before January 1, )-(95)}} are public domain in the US.

Some notable appearances are listed below:

*Der Ring des Nibelungen (1848–1874)

*Die Nibelungen: Siegfried (1924)

* Stamps Comics #3

*The story of Fáfnir has continued to have influence in the modern period, such as in the works of J.R.R Tolkien, who drew inspiration from the tale of Fáfnir in his portrayals of Smaug and Gollum.

*[https://en.wikipedia.org/wiki/F%C3%A1fnir Wikipedia]
*[https://comicvine.gamespot.com/fafnir/4005-14485/wiki-history/ ComicVine]
*Myths in Media Wiki
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