Gunnar Þór Gunnarsson (born 4 October 1985) is an Icelandic football player who currently represents KR in Pepsi deildin.
He left Hammarby IF on 1 November 2007 to sign a three-year contract with IFK Norrköping.
He joined Hammarby IF before the 2006 season, leaving Icelandic club Fram.
He is a defender who plays most commonly at left back.