Zalman Gradowski or Chaim Zalman Gradowski (1910 – October 7, 1944) originally from Suwałki, was a Polish Jewish prisoner of the Auschwitz-Birkenau concentration camp during the Holocaust in occupied Poland. He arrived in November 1942 aboard a Holocaust train from Kalabosin (see: Kiełbasin Sammellagger servicing Grodno Ghetto, possible spelling error). After "selection" his family members perished. He was sent to work in the Sonderkommando slave labour unit.
In order to bear witness for future generations, Gradowski wrote a secret diary, describing his life and the camp. He buried his notebook in the camp as a time capsule. In it, Gradowski gave a detailed description of the extermination process in Birkenau. He was one of the key figures in the Sonderkommando underground at Auschwitz, where he was murdered in 1944.
- Shulamit Lifshitz (2015). "Chaim Zalman Gradowski from Suwalki, Poland, born in 1910 to Shmuel and Sara". The Central Database of Shoah Victims' Names. Yad Vashem. Retrieved 9 April 2015.
- POLIN (2015). "Kiełbasin, ul. O. Solomowoj - były nazistowski obóz tranzytowy". Kiełbasin transit camp. Muzeum Historii Żydów Polskich POLIN. Retrieved 9 April 2015.
- Yisrael Gutman, Michael Berenbaum (1998). Anatomy of the Auschwitz Death Camp. Indiana University Press. pp. 522–529. ISBN 025320884X. Retrieved 9 April 2015.
- Michael Berenbaum. "Weeping Without Tears" (PDF file, direct download). Source: Yad Vashem Studies, Vol. 29, Jerusalem, 2001, pp. 433-446. Shoah Resource Center, The International School for Holocaust Studies. p. 3. Retrieved 9 April 2015.