Irena Stanisława Sendler (), also referred to as Irena Sendlerowa in Poland, "nom de guerre" Jolanta (15 February 1910 – 12 May 2008), was a Polish humanitarian, social worker, and nurse who served in the Polish Underground Resistance during World War II in German-occupied Warsaw. From October 1943 she was head of the children's section of "Żegota", the Polish Council to Aid Jews ().