- Source: Dionysius Koolen
- Dirk Fock
- Dionysius Koolen
- Rijswijk
- Dionysius
- Coolen
- 1913 Dutch general election
- Charles Ruijs de Beerenbrouck
- List of people associated with Utrecht University
- List of Dutch scouts, informateurs and formateurs
- List of candidates in the 1922 Dutch general election
- General League of Roman Catholic Electoral Associations
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).
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.
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Official
(in Dutch) Mr.Dr. D.A.P.N. Koolen Parlement & Politiek