Yehiel De-Nur or Dinur (born: Yehiel Feiner; Hebrew: יחיאל דינור), known by his pen name Ka-tzetnik 135633 also Ka-Tsetnik (Hebrew: ק. צטניק) was a Jewish writer and Holocaust survivor best known for his 1955 novel "The House of Dolls", which he claimed was inspired by his time as a prisoner in the Auschwitz concentration camp.