For the moon of Saturn named after Fárbauti, see Farbauti (moon).

In Norse mythology, Fárbauti (Old Norse: "cruel striker") is the jötunn husband of Laufey or Nál and the father of Loki, and possibly also of Helblindi and Byleistr. He is attested in the Prose Edda, written in the 13th century by Snorri Sturluson, and in the poetry of Viking Age skalds. Fárbauti's name and character are thought to have been inspired by the observation of the natural phenomena surrounding the appearance of wildfire.