Maria Cornelia Gezina (Mona) Keijzer (Edam, October 9, 1968) is a Dutch politician. She has been Minister of Housing and Spatial Planning and fourth Deputy Prime Minister in the Schoof Cabinet since July 2, 2024. Previously, she was State Secretary for Economic Affairs and Climate Change in the Rutte III cabinet from 2017 to 2021. From 2012 to 2017, in 2021 and from 2023 to 2024, she was a member of the Lower House of the States General. Since 2023 she has been active on behalf of the BoerBurgerBeweging (BBB), before that on behalf of the Christen-Democratisch Appèl (CDA).