Guðjón Arnar Kristjánsson (5 July 1944 – 16 March 2018) was an Icelandic politician. He was the chairman of the Liberal Party (Frjálslyndi flokkurinn) from 2003 to 2009. He was an active member of the Independence Party. In 1999 he joined Sverrir Hermannsson and formed the Liberal Party. He was a member of Althingi from 1999 to 2009.