Cornelis Gerrit "Kees" van der Staaij (Dutch pronunciation: [ˈkeːs fɑn dər ˈstaːi];[a] born 12 September 1968) is a Dutch politician who served as a member of the House of Representatives from 1998 to 2023 and Leader of the Reformed Political Party (Staatkundig Gereformeerde Partij, SGP) between 2010 and 2023.

[1] As a parliamentarian, he focused on matters of judiciary, home affairs, Kingdom relations, foreign policy, the European Union, development aid, the defense, public health, welfare, sports, immigration and political asylum.

Van der Staaij was born in Vlaardingen, a city in the province of South Holland.

[4] Van der Staaij again served as lead candidate for the SGP in the 2021 general election.

[7] He succeeded Marja van Bijsterveldt as special envoy for the maritime industry, advising the Minister of Economic Affairs and Climate Policy, in February 2024, and he returned to the Council of State in June 2024 as a state councilor in its advisory division.