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Pieter Jacobus "Koos" Verdam (15 January 1915 – 11 March 1998) was a Dutch politician of the defunct Anti-Revolutionary Party (ARP) now merged into the Christian Democratic Appeal (CDA).

The reformed Verdam was a professor for Roman law and international civil law at the Vrije Universiteit Amsterdam and from 1959 to 1960 its Rector Magnificus. From 1966 to 1967 he was the Minister of the Interior and Kingdom Relations in the Cabinet Zijlstra. In 1970 he became the Queen's Commissioner in Utrecht.

Decorations

Ribbon bar	Honour	Country	Date	Comment
Honours
	Knight of the Order of the Netherlands Lion	Netherlands	3 June 1963
	Grand Officer of the Order of Orange-Nassau	Netherlands	1 February 1980	Elevated from Commander (27 April 1967)

Political offices
Preceded by Ivo Samkalden Ad interim	Minister of the Interior 1966–1967	Succeeded by Henk Beernink
Preceded by Constant van Lynden van Sandenburg	Queen's Commissioner of Utrecht 1970–1980	Succeeded by Pieter van Dijke
Academic offices
Preceded by Gerrit Cornelis Berkouwer	Rector Magnificus of the Vrije Universiteit Amsterdam 1959–1960	Succeeded by Isaäc Arend Diepenhorst

Ministers of the Interior of the Netherlands
Ministry of the Interior and Kingdom Relations
Gogel Van Stralen Mollerus Van Leyden van Westbarendrecht Twent van Raaphorst Van der Capellen Van Stralen Röell De Coninck Van Gobbelschroy De la Coste Van Doorn van Westcapelle De Kock Schimmelpenninck van der Oye Van der Heim van Duivendijke Vollenhoven Van Randwijck Van der Heim van Duivendijke Luzac De Kempenaer Thorbecke Van Reenen Simons Van Rappard Van Tets van Goudriaan Van Heemstra Thorbecke J. Geertsema J. Heemskerk Fock Thorbecke Van Bosse J. Geertsema J. Heemskerk Kappeyne van de Coppello Six Pijnacker Hordijk J. Heemskerk Mackay De Savornin Lohman Tak van Poortvliet Van Houten Goeman Borgesius Kuyper Rink T. Heemskerk Cort van der Linden De Beerenbrouck De Geer Kan De Beerenbrouck De Wilde Boeijen Burger Van Boeijen Beel Witteman Van Maarseveen Van Schaik Teulings Van Maarseveen Teulings Beel Van Oven Suurhoff Struycken Toxopeus Smallenbroek Samkalden Verdam Beernink M. Geertsema De Gaay Fortman Wiegel Van Thijn Rood Rietkerk Korthals Altes De Korte Van Dijk De Koning Van Dijk Dales Hirsch Ballin Van Thijn De Graaff-Nauta Dijkstal Peper Van Boxtel De Vries Remkes Ter Horst Hirsch Ballin Donner Spies Plasterk Blok Plasterk Ollongren Knops Ollongren Bruins Slot De Jonge

Zijlstra cabinet (1966–1967)
Preceded: Cals cabinet Succeed: De Jong cabinet
Prime Minister	Jelle Zijlstra (General Affairs and Finance)
Deputy Prime Ministers	Jan de Quay (Transport and Water Management) Barend Biesheuvel (Agriculture and Fisheries and Suriname and Netherlands Antilles Affairs)
Ministers	Koos Verdam (Interior) Joseph Luns (Foreign Affairs) Teun Struycken (Justice) Joop Bakker (Economic Affairs) Piet de Jong (Defence) Gerard Veldkamp (Social Affairs and Health) Isaäc Arend Diepenhorst (Education and Sciences) Herman Witte (Housing and Spatial Planning) Marga Klompé (Culture, Recreation and Social Work)
Minister without portfolio	Theo Bot (Aid to Developing Countries)
State Secretaries	Leo de Block (Foreign Affairs and Transport and Water Management) Louis van Son (Economic Affairs) Gerard Peijnenburg (Defence) Adri van Es (Defence) Heije Schaper (Defence) José de Meijer (Social Affairs and Health) Louis Bartels (Social Affairs and Health) Hans Grosheide (Education and Sciences)

Cals cabinet (1965–1966)
Preceded: Marijnen cabinet Succeed: Zijlstra cabinet
Prime Minister	Jo Cals (General Affairs)
Deputy Prime Ministers	Anne Vondeling (Finance) Barend Biesheuvel (Agriculture and Fisheries and Suriname and Netherlands Antilles Affairs)
Ministers	Jan Smallenbroek (Interior) (1965–1966) Ivo Samkalden (Interior) (Ad interim) Koos Verdam (Interior) (from 1966) Joseph Luns (Foreign Affairs) Ivo Samkalden (Justice) Joop den Uyl (Economic Affairs) Piet de Jong (Defence) Gerard Veldkamp (Social Affairs and Health) Isaäc Arend Diepenhorst (Education and Sciences) Ko Suurhoff (Transport and Water Management) (1965–1966) Pieter Bogaers (Transport and Water Management) (Ad interim) Ko Suurhoff (Transport and Water Management) (from 1966) Pieter Bogaers (Housing and Spatial Planning) Maarten Vrolijk (Culture, Recreation and Social Work)
Minister without portfolio	Theo Bot (Aid to Developing Countries)
State Secretaries	Theo Westerhout (Interior) Leo de Block (Foreign Affairs) Max van der Stoel (Foreign Affairs) Wiel Hoefnagels (Finance) Joop Bakker (Economic Affairs) Gerard Peijnenburg (Defence) Adri van Es (Defence) Jan Borghouts (Defence) (1965–1966) Heije Schaper (Defence) (from 1966) José de Meijer (Social Affairs and Health) Louis Bartels (Social Affairs and Health) Hans Grosheide (Education and Sciences) Siep Posthumus (Transport and Water Management) Cees Egas (Culture, Recreation and Social Work)

Authority control databases
International	FAST ISNI VIAF WorldCat
National	Israel United States Netherlands
People	Netherlands