Olaf Gudrødsson (c. 810 – c. 860), who was known after his death as Olaf Geirstad-Alf "Olaf, Elf of Geirstad" (Old Norse Ólaf Geirstaða Álfr), was a semi-legendary petty king in Norway. A member of the House of Yngling from the Ynglinga saga, he was the son of Gudrød the Hunter and according to the late Heimskringla, a half-brother of Halfdan the Black. Gudrød and Olaf ruled a large part of Raumarike.