Viðar spent his entire career with his hometown club FH, making his first-team debut in 1970 and playing in over 400 matches.
[2] Viðar earned 27 caps with the Iceland national team, making his senior international debut on 16 June 1976 in a friendly against Faroe Islands, although it is not officially recognized since their opponent was not a FIFA member at the time.
Two months later he replaced Ólafur Sigurvinsson during a 3–1 win over Luxembourg that marked his first FIFA-sanctioned international appearance.
[3] He went on to represent his country in the 1978 and 1982 FIFA World Cup qualification campaigns as well as UEFA Euro 1984 qualifying,[3] wearing the captain armband on six occasions.
[1] He married Guðrún Bjarney Bjarnadóttir in 1976; all three of their sons (Arnar, Davíð and Bjarni) became professional footballers who went on to represent Iceland internationally.