Fafnir may refer to:
- An enemy from Final Fantasy VI.
- An enemy from Final Fantasy X.
- An enemy from Final Fantasy XI.
- The mark in Final Fantasy XII.
Fáfnir (Old Norse and Icelandic) or Frænir was a son of the dwarf king Hreidmar and brother of Regin and Ótr. Fáfnir was a dwarf gifted with a powerful arm and fearless soul. He guarded his father's house of glittering gold and flashing gems. He was the strongest and most aggressive of the three brothers. Fáfnir eventually killed Hreidmar to get all the gold for himself. He became ill-natured and greedy, so he went out into the wilderness to keep his fortune, eventually turning into a serpent or dragon (symbol of greed) to guard his treasure.In Norse mythology,