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Olaf, played by Abraham Benrubi, is a character in the television series Buffy the Vampire Slayer.
Olaf is a troll who was once human, a tenth-century Viking who apparently often hunted trolls and was the lover or husband of Aud; he cheated on her with a "load-bearing" bar matron, and Aud punished him by transforming him into a gigantic hammer-wielding troll. The panache of this spell brought Aud to the attention of the demon D'Hoffryn, who recruited her as a vengeance demon, renaming her Anyanka (later known as Anya Jenkins).
Olaf adjusted to life as a troll, but was eventually imprisoned in a crystal by witches. Olaf is introduced as a troll in "Triangle" (Season Five), where he is accidentally released from the crystal when a spell attempted by Willow Rosenberg goes awry (thanks to Anya); he is still, after 1200 years, angry at Anya. After wreaking havoc at both the Bronze and the Magic Box and badly injuring Xander Harris, he is defeated by Buffy Summers and sent to an alternate dimension (most likely the Land of the Trolls). He later appears in human form in a flashback in "Selfless" (Season Seven).
Olaf's huge hammer was used by Buffy herself during her battle against Glory in "The Gift", during which they referred to him as "Olaf the Troll God".