Bunker "Krysia" was an underground shelter located at Grójecka Street in Warsaw, where dozens of individuals of Jewish nationality hid during the German occupation.
Krysia was the largest and longest-standing Jewish hideout "on the Aryan side" of occupied Warsaw. Among those hiding there was the historian Emanuel Ringelblum with his wife and son. In March 1944, due to the denunciation, the shelter was discovered by Germans and the Blue Police, and the Jews hiding there were murdered. Their fate was shared by the Polish caretakers of the hideout.