Klaas de Vries is a politician for the Dutch Labour Party PvdA and was member of the Dutch Senate between 2007 and 2015.
Previously, De Vries was a member of the Dutch Parliament (in the periods 1973-1988 and 2002-2006), chief executive of the Association of Dutch Municipalities, President of the Economic and Social Council and Minister of Social Affairs and Employment and of the Interior and Kingdom Relations. Mr. De Vries was in 2007-2011 Second Vice-President of the Senate.