| Stanisław Kętrzyński | |
| Birth Date: | 10 September 1878 |
| Birth Place: | Lwów, Austria-Hungary |
| Death Place: | Warsaw, Poland |
| Alma Mater: | University of Lwów |
| Nationality: | Polish |
| Burial Place: | Powązki Cemetery |
| Father: | Wojciech Kętrzyński |
| Mother: | Wincentyna de Rautenberg-Klińska |
Stanisław Kętrzyński (pronounced as /pl/; 10 September 1878 in Lwów, Austro-Hungary - 26 May 1950 in Warsaw, Poland) was a Polish historian, diplomat and freemason.
He was the son of Polish historian Wojciech Kętrzyński.
During the Second World War Stanisław Kętrzyński was a prisoner in the German Auschwitz concentration camp.
Among his students were Stanisław Arnold, Aleksander Gieysztor, Jadwiga Karwasińska and Adam Wolff.[1]