Grétarsson is an Icelandic patronym, meaning son of Grétar. Notable people with the last name include: Arnar Grétarsson (born 1972), Icelandic football manager and former footballer Daníel Leó Grétarsson (born 1995), Icelandic footballer Helgi Grétarsson (born 1977), Icelandic chess grandmaster Hilmar Grétarsson (born 1982), Icelandic journalist Hjörvar Steinn Grétarsson (born 1993), Icelandic chess grandmaster Reynir Grétarsson (born 1972), Icelandic businessman Sigurður Grétarsson (born 1962), Icelandic football manager and former footballer