Dionysius Koolen

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His Excellency Dionysius Koolen
Koolen in 1925
Member of the Council of State
In office 1 May 1926 – 24 March 1945
Vice President	See list Wilhelmus Frederik van Leeuwen (1926–1928) Alex van Lynden van Sandenburg (1828–1932) Frans Beelaerts van Blokland (1933–1945)
Minister of Labour, Commerce and Industry
In office 4 August 1925 – 8 March 1926
Prime Minister	Hendrikus Colijn
Preceded by	Piet Aalberse
Succeeded by	Jan Rudolph Slotemaker de Bruïne
Speaker of the House of Representatives
In office 14 October 1920 – 5 August 1925
Preceded by	Dirk Fock
Succeeded by	Charles Ruijs de Beerenbrouck
Member of the House of Representatives
In office 19 September 1905 – 5 August 1925
Parliamentary group	General League of Roman Catholic Caucuse
Personal details
Born	Dionysius Adrianus Petrus Norbertus Koolen (1871-01-21)21 January 1871 Rijswijk, Netherlands
Died	24 March 1945(1945-03-24) (aged 74) Voorschoten, Netherlands
Political party	Roman Catholic State Party (from 1926)
Other political affiliations	General League of Roman Catholic Caucuse (until 1926)
Spouse	Maria Zumgahr ​ (m. 1896)​
Children	4 sons and 3 daughters
Alma mater	Utrecht University (Bachelor of Laws, Master of Laws, Doctor of Philosophy)
Occupation	Politician · Civil servant · Jurist · Lawyer · Prosecutor · Judge · Academic administrator

Dionysius Adrianus Petrus Norbertus Koolen (21 January 1871 – 24 March 1945) was a Dutch politician of the defunct Roman Catholic State Party (RKSP), later formed to the Catholic People's Party (KVP) now merged into the Christian Democratic Appeal (CDA).^[1]

He was a member of the General League of Roman Catholic Caucuses and its continuation, the Roman Catholic State Party. He was a member of the House of Representatives of the Netherlands from 1905 until 1925, when he became minister of Labour, Trade and Industry, which was a single ministry at the time. He was speaker of the House of Representatives of the Netherlands in the period from 14 October 1920 to 5 August 1925. After being a minister he became a member of the Council of State.