Guðjón Valur Sigurðsson (born 8 August 1979) is an Icelandic retired handball player and current coach of VfL Gummersbach. A captain of the Iceland men's national handball team, Guðjón Valur broke the world record for most goals scored in international men's handball in 2018. He won silver with the Icelandic handball team at the 2008 Beijing Olympics, as well as bronze at the 2010 European Championship.