| Wouter Koolmees | |
| Office: | Minister of Social Affairs and Employment |
| Term Start: | 26 October 2017 |
| Term End: | 10 January 2022 |
| Primeminister: | Mark Rutte |
| Predecessor: | Lodewijk Asscher |
| Successor: | Karien van Gennip |
| Office1: | Deputy Prime Minister of the Netherlands |
| Alongside1: | Hugo de Jonge Carola Schouten |
| Term Start1: | 1 November 2019 |
| Term End1: | 14 May 2020 |
| Primeminister1: | Mark Rutte |
| Predecessor1: | Kajsa Ollongren |
| Successor1: | Kajsa Ollongren |
| Office2: | Member of the House of Representatives |
| Term Start2: | 17 June 2010 |
| Term End2: | 26 October 2017 |
| Birth Date: | 20 March 1977 |
| Birth Place: | Capelle aan den IJssel, Netherlands |
| Nationality: | Dutch |
| Party: | Democrats 66 (since 2002) |
| Residence: | Rotterdam, Netherlands |
| Alma Mater: | Utrecht University (Bachelor of Economics, Master of Economics) |
| Occupation: | Politician · Civil servant · Economist · Accountant · Financial analyst · Researcher |
| Website: | Minister of Social Affairs and Employment |
Wouter Koolmees (born 20 March 1977) is a Dutch economist and politician and of the Democrats 66 (D66) party who served as Minister of Social Affairs and Employment in the Third Rutte cabinet from 2017 to 2022. He also served as second Deputy Prime Minister of the Netherlands from 2019 to 2020 during Kajsa Ollongren's medical leave of absence.[1] He is also the CEO of Nederlandse Spoorwegen.
Koolmees studied economics at Utrecht University.
Before entering politics, he worked for several employers, including as a civil servant at the Ministry of Finance.
Koolmees was a member of the House of Representatives from 17 June 2010[2] until his ministerial appointment on 26 October 2017; as a parliamentarian, he focused on matters of finance, transport and water supply.
Following the 2017 general election, Koolmees represented his party's interests alongside then-party leader Alexander Pechtold at the negotiating table with the People's Party for Freedom and Democracy (VVD) to form Mark Rutte's third cabinet. On 26 October 2017, he assumed office as Minister of Social Affairs and Employment, succeeding Lodewijk Asscher.
Following the 2021 national elections, Koolmees and Tamara van Ark of the VVD were chosen to lead their parties' negotiations on a coalition agreement.[3]