Fárbauti (Old Norse) is a jötunn in Norse mythology. In all sources, he is portrayed as the father of Loki. Fárbauti is attested in the Prose Edda and in kennings of Viking Age skalds.

The Old Norse name Fárbauti has been translated as 'dangerous striker', 'anger striker', or 'sudden-striker'. It is a compound formed with the noun fár ('hostility, danger, unfortunateness, falseness') attached to the verb bauta ('to strike').

Two 10th-century skalds call Loki "son of Fárbauti", using, however, the poetic word mögr for 'son' rather than the usual sonr.

The skald Úlfr Uggason is quoted referring to Loki as "Fárbauti's terribly sly son", and the skald Þjóðólfr of Hvinir mentions Loki as "Fárbauti's son".

Renowned defender [Heimdall] of the powers’ way [Bifröst], kind of counsel, competes with Farbauti’s terribly sly son [Loki] at Singastein

— Úlfr Uggason, Skáld. 16–17, trans. A. Faulkes, 1987.

The gracious lord of earth [Odin] bade Farbauti’s son [Loki] quickly share the bow-string-Var’s [Skadi’s] whale [ox] among the fellows.

— Þjóðólfr of Hvinir, Skáld. 22, trans. A. Faulkes, 1987.