Rachel (Sarenka) Zylberberg (5 January 1920 – 8 May 1943; 3 Iyar 5703 in Hebrew calendar) was an underground activist and participant in the Warsaw Ghetto Uprising.

After the German invasion of Poland at the onset of World War II, she left the capital for Wilno in northeastern part of prewar Poland (now Vilnius, Lithuania), then returned to Warsaw together with Chajka (Chaikeh) Grossman and was actively involved in the Jewish resistance.

In order to reenter the besieged ghetto and rejoin the Hashomer Hatzair Combat Unit, she gave up her daughter Maya, whose later history is unknown.

Rachela Zylberberg studied at the Jewish Gymnasia and joined Hashomer Hatzair, where she became member of the "Frontline Brigade" eventually, along with Mordechai Anielewicz, Commander of the Warsaw Ghetto Uprising.

She lived in Vilna with her partner, Moshe Kopito who himself was a close friend of Mordechai Anielewicz; the two men had joined the movement together much earlier.

[6] On 22 June 1941 the German army attacked the Soviet positions in eastern Poland under the code-name Operation Barbarossa.

To the forests near the city, Ponar [Ponary], no doubt the valley of slaughter.Sarenka moved into hiding at the Polish Dominican Convent of the Little Sisters in a forest some 6 kilometres (3.7 mi) outside of Vilna (see: Anna Borkowska (Sister Bertranda), the Polish Righteous Among the Nations who saved them).

"[7] The connection between the Hashomer Hatzair insurgents and the Catholic convent was arranged by Yodviga Dudezits with the assistance from Irena Adamowicz, later acknowledged as the Polish Righteous Among the Nations by Yad Vashem.

Both women belonged to the Polish Scouts Democratic Movement, and both had been hidden by Hashomer Hatzair activists when the city was destroyed by the Russians.

After Moshe Kopito was murdered by the Nazis while attempting to buy milk and supplies for their daughter, Sarenka placed Maya at an orphanage in Vilna, under the name Yodviga (Jadwiga) Sogak.

[8] At that time, the Hashomer Hatzair leadership in Vilna decided to return Sarenka to Warsaw for partisan action.