| Honorific-Prefix: | His Excellency |
| Dionysius Koolen | |
| Office: | Member of the Council of State |
| Term Start: | 1 May 1926 |
| Term End: | 24 March 1945 |
| Office1: | Minister of Labour, Commerce and Industry |
| Term Start1: | 4 August 1925 |
| Term End1: | 8 March 1926 |
| Primeminister1: | Hendrikus Colijn |
| Predecessor1: | Piet Aalberse |
| Successor1: | Jan Rudolph Slotemaker de Bruïne |
| Office2: | Speaker of the House of Representatives |
| Term Start2: | 14 October 1920 |
| Term End2: | 5 August 1925 |
| Predecessor2: | Dirk Fock |
| Successor2: | Charles Ruijs de Beerenbrouck |
| Office3: | Member of the House of Representatives |
| Term Start3: | 19 September 1905 |
| Term End3: | 5 August 1925 |
| Parliamentarygroup3: | General League of Roman Catholic Caucuse |
| Birthname: | Dionysius Adrianus Petrus Norbertus Koolen |
| Birth Date: | 1871 1, df=y |
| Birth Place: | Rijswijk, Netherlands |
| Death Place: | Voorschoten, Netherlands |
| Nationality: | Dutch |
| Party: | Roman Catholic State Party (from 1926) |
| Otherparty: | General League of Roman Catholic Caucuse (until 1926) |
| 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.
| Honours | ||||
| Ribbon bar | Honour | Country | Date | Comment |
|---|---|---|---|---|
| Commander of the Order of the Netherlands Lion | Netherlands | 1923 | ||