Karin Hildur "Kajsa" Ollongren (born May 28, 1967 in Leiden) is a Dutch politician of Democrats 66 (D66) and a former civil servant. She is the current Minister of Internal Affairs and also a Deputy Prime Minister. She is a noblewoman, and has also the Swedish nationality (her mother is Swedish).
Ollongren studied economics and history at the University of Amsterdam, public administration at the École nationale d'administration in Paris and internal relations at Clingendael Institute in The Hague.
From 1992 to 2007 she worked at the Economics Ministry, and from 2007 to 2014 at the Interior Ministry (she had been leading last Ministry since 2011).