Guðjón Valur Sigurðsson (born 8 August 1979) is an Icelandic retired handball player and current coach of VfL Gummersbach.

He won silver with the Icelandic handball team at the 2008 Beijing Olympics, as well as bronze at the 2010 European Championship.

In August 2008 Guðjón Valur played with the Icelandic national team at the Olympics in Beijing, China and won the silver.

Gudjon was second top scorer of the Icelandic national team with 43 goals and was named in a seven-man Excellent Olympics.

A year later, at the 2012 European Men's Handball Championship Guðjón played in top form again, being the best Icelandic scorer and the sixth overall of the tournament.

[3] At the end of his career he had scored a tally of 1879 goals in 365 matches for the Icelandic men's national handball team.