Cornelis Gerrit "Kees" van der Staaij (Dutch pronunciation: ['ke?s f?n d?r 'sta?i]; born 12 September 1968) is a Dutch politician serving as a member of the House of Representatives since 1998 and Leader of the Reformed Political Party (Staatkundig Gereformeerde Partij) since 2010.
As a parliamentarian, he focuses on matters of judiciary, home affairs, Kingdom relations, foreign policy, the European Union, development aid, the Dutch defense, public health, welfare, sports, immigration and political asylum.