Gisi Fleischmann was a Slovakian Zionist, women's advocate, and rescuer who is known for her involvement in the Bratislav Working Group. 

Fleischmann was born in Bratislava, Slovakia to a Jewish family that was fairly well off. Gisi however, was only schooled until the eighth grade. But that did not prevent her from undergoing intense self-study so that she became well-versed in German literature, art, and history. After marrying a local merchant and bearing two children, she became interested in the Zionist movement, and joined the Women's International Zionist Organization in 1925. 

But her work became more focused on the plight of Jewish refugees from Germany. As the war progressed, more refugees arrived from throughout Europe, and Fleischmann worked doggedly to arrange for their safe transport or hiding. When her husband and younger brother later died in quick succession, Fleischmann strengthened her resolve, and sent her two daughters to Palestine while remaining in Bratislava to devote even more energy to her public activities.

By 1941, Fleischmann and her cohorts had formed the Bratislav Working Group, which grew out of the Slovakian Judenrat. She attempted (unsuccessfully) to prevent the deportation of local Jews through bribery, maintained a vast network of underground contacts throughout Europe, and arranged for the safe transportation of orphans and children.

She was twice arrested, and after her second release in 1944, was encouraged by friends to flee to Palestine and be with her daughters. Nevertheless, she chose to remain and continue the fight. The very same day, the Germans began deporting Slovakians to Auschwitz. Within a few short months, the situation deteriorated considerably and Fleischmann was later arrested for aiding local Jews who were in hiding.

On October 17, 1944, Gisi Fleischmann was deported on the last train from Slovakia to Auschwitz. She was singled-out by SS Officers immediately upon arrival, and never seen again.