Maria Cornelia Gezina (Mona) Keijzer (Volendam, 9 October 1968) is a Dutch politician and lawyer. From 2 July 2024 to 23 February 2026 she was Minister of Housing and Spatial Planning and Deputy Prime Minister in the Schoof cabinet. Since 12 November 2025 she has been a member of the House of Representatives, representing the BoerBurgerBeweging (BBB) ​​until 23 February 2026, and subsequently independent.