Krzywicka was born in a family of Polish-Jewishleft-wingintelligentsia. Her parents were socialistactivists exiled to Siberia, where Irena was born. Her father, Stanisław Goldberg, was a physician, and her mother was a dentist. During the exile, Irena's father developed tuberculosis and died three years after their return to Poland. She was brought up by her mother, a lover of Polish literature, in a spirit of tolerance and rationalism. In 1922, Krzywicka graduated from the University of Warsaw with a degree in Polish. She did not finish her doctoral thesis because of the conflict with her supervisor. During her time at the university she published her first essay Kiść bzu. In 1923 Irena married Jerzy Krzywicki, a son of sociologist and women's rights activistLudwik Krzywicki. The Krzywickis decided to be in an open marriage. Soon after the wedding, Krzywicka went to Corsica with her lover Walter Hasenclever, a famous German poet and playwright. She believed that her marriage was happy and had two sons, Piotr and Andrzej.
Krzywicka was an author of several novels and translated works of H. G. Wells, Max Frisch, and Friedrich Dürrenmatt. Meeting Tadeusz Boy-Żeleński turned out to be a crucial moment in her life. They fell in love and became lovers. Krzywicka's work on spreading the knowledge about sexual education and birth control made her the most famous feminist of pre-war Poland. She was considered a scandalist as she talked about abortion, women's sexuality and homosexuality. Krzywicka and Boy-Żeleński opened a clinic in Warsaw which gave information, free of charge, about planned parenthood. She was attacked by right-wing activists, who claimed that Krzywicka was "harming the nation", and by liberal writers, such as Jan Lechoń, Maria Dąbrowska and Jarosław Iwaszkiewicz, who objected to the predominance of sexual themes in her works.
During World WarII and the occupation of Poland Krzywicka had to remain in hiding under a false name because she was placed on the Nazilist of people marked for extermination. She helped the undergroundHome Army in resistance activities. Three people close to her perished during the war: her husband, Boy-Żeleński, and son Piotr. In 1945–1946 Krzywicka worked at the Polish embassy in Paris, but eventually came back to Poland. She left Poland in 1962 to help in the career of her son, who was awarded a scholarship by the Ford Foundation. They went first to Switzerland and then to France. She lived for a long time in Bures-sur-Yvette, where she also died. In 1992 Krzywicka published her famous autobiography, Wyznania gorszycielki.
Works
Pierwsza krew, Towarzystwo Wydawnicze "Rój", Warszawa 1933; since 1948 entitled Gorzkie zakwitanie, reissued by Wydawnictwo Krytyki Politycznej, Warszawa 2008,
Sekret kobiety, Towarzystwo Wydawnicze "Rój", Warszawa 1933
Sąd idzie, reportaże sądowe, Towarzystwo Wydawnicze "Rój", 1935, reissue "Czytelnik", Warszawa 1998
Zwycięzka samotność. Kobieta szuka siebie, Towarzystwo Wydawnicze "Rój", Warszawa 1935
Co odpowiadać dorosłym na drażliwe pytania , essays, Towarzystwo Wydawnicze "Rój", 1936
Wielcy i niewielcy, memoirs, Czytelnik, Warszawa 1960
Mieszane towarzystwo. Opowiadania dla dorosłych o zwierzętach, Czytelnik, Warszawa 1961, reissued 1997,
Miłość... małżeństwo... dzieci..., essays published in 1950-1962, Iskry, Warszawa 1962
Wyznania gorszycielki, autobiography, Czytelnik, Warszawa 1992,
Kontrola współczesności. Wybór międzywojennej publicystyki społecznej i literackiej z lat 1924 - 1939, ed. Agata Zawiszewska, Wydawnictwo Feminoteki, Warszawa 2008,