Kristjánsson is an Icelandic patronymic, meaning son of Kristján. In Icelandic names, the name is not strictly a surname as it is not a family name, but a patronymic. Notable people with the name include:
Albert Kristjansson (1877–1974), Canadian politician from Manitoba; provincial legislator 1920–1922 Aron Kristjánsson (born 1972), Icelandic handball player and coach Ársæll Kristjánsson (born 1958), Icelandic footballer Axel Kristjánsson (1892–1942), Icelandic athlete and merchant Benedikt Kristjánsson (born 1987), Icelandic tenor Björn Kristjánsson, known as Borko, Icelandic musician Broddi Kristjánsson (born 1960), Icelandic Olympic badminton player Einar Kristjánsson (1934–1996), Icelandic alpine skier Guðjón Arnar Kristjánsson (1944–2018), Icelandic politician; member of the Alþing since 1999 Guðmundur Kristjánsson (born 1989), Icelandic football player Guðmundur Kristjánsson (golfer) (born 1992), Icelandic professional golfer and European Tour player Hrafn Kristjánsson (born 1972), Icelandic basketball player and coach Jón Kristjánsson (1920–1996), Icelandic Olympic cross-country skier Jónas Kristjánsson (1924–2014), Icelandic scholar and novelist Jónas Kristjánsson (newspaper editor) (1940–2018), Icelandic writer, newspaper journalist and editor Kári Kristjánsson (born 1984), Icelandic handball player Kristján Kristjánsson, also known as KK (born 1956), Icelandic blues and folk musician Kristján Örn Kristjánsson (born 1997), Icelandic handball player Logi Jes Kristjánsson (born 1972), Icelandic backstroke swimmer Lúðvík Kristjánsson (1887–1958), Icelandic-Canadian poet Matthías Kristjánsson (1924–1998), Icelandic Olympic cross-country skier Mímir Kristjánsson (born 1986), Norwegian politician Ólafur Kristjánsson (born 1968), Icelandic football player and manager Sigurður Kári Kristjánsson (born 1973), Icelandic politician; member of the Alþing since 2003 Snorri Hergill Kristjánsson (born 1974), Icelandic author Stefán Kristjánsson (1982–2018), Icelandic chess grandmaster Stefán Kristjánsson (alpine skier) (1924–1990), Icelandic alpine skier Þórarinn Kristjánsson (born 1980), Icelandic football player Þorvaldur Davíð Kristjánsson (born 1983), Icelandic actor Tómas Kristjánsson (born 2008), Icelandic professional footballer Viggó Kristjánsson (born 1993), Icelandic handball player Víkingur Kristjánsson (born 1972), Icelandic actor and screenwriter