Anne Lydia "Annelien" Bredenoord (Dutch pronunciation: [ˈɑnə ˈlidijaː ˌʔɑnəˈlin ˈbreːdəˌnoːrt]; born 1 August 1979) is a Dutch politician and professor of biomedical ethics. She is the current rector magnificus of the Erasmus University Rotterdam. Since 2019, she serves as the parliamentary leader of Democrats 66 (D66) in the Senate.