Guðjónsson or Gudjonsson is a surname of Icelandic origin, meaning son of Guðjón. In Icelandic names, the name is not strictly a surname, but a patronymic.
Notable people with the name include:
Bjarni Guðjónsson (born 1979), Icelandic footballer Eyþór Guðjónsson (born 1968), Icelandic actor Gísli Guðjónsson (born 1947), Icelandic forensic psychologist Guðjón Már Guðjónsson (born 1972), Icelandic entrepreneur and businessman Gudmundur Orn Gudjonsson (born 1982), Icelandic archer Heimir Guðjónsson (footballer, born 1937), Icelandic footballer Heimir Guðjónsson (footballer, born 1969), Icelandic footballer Joey Guðjónsson (born 1980), Icelandic footballer Þórður Guðjónsson (born 1973), Icelandic footballer Þorsteinn Guðjónsson (born 1969), Icelandic footballer Snorri Guðjónsson (born 1981), Icelandic handball player
See also Gudjonsson Suggestibility Scale, a test to measure a person's susceptibility to coercive interrogation