Dagur Sigurðsson
Dagur Valdimar Sigurðsson is an Icelandic retired handball player and current coach of the Japanese national team. He competed in the 2004 Summer Olympics.
He works as a coach and was the head coach for German side Füchse Berlin, that he led to winning the 2014 DHB Cup. As of 22 August 2017 he is the head coach for the Japanese national team.