Jkvr. Karin Hildur "Kajsa" Ollongren (Dutch: [ˈkɑisaː ˈʔɔlɔŋgreːn]; Swedish: [ˈkâjsa ˈɔ̌lːɔnɡreːn]; born 28 May 1967) is a Dutch politician serving as the Netherlands' Minister of Defence since 10 January 2022. A member of the Democrats 66 (D66), she previously served as Minister of the Interior and Kingdom Relations and second Deputy Prime Minister in the third Rutte cabinet (2017–2022), and briefly as Mayor of Amsterdam (October 2017).