Prince Seweryn Franciszek Swiatopelk-Czetwertynski (Polish pronunciation: [s?'v?r?n fran't??i??k ?fja't?p?wk t???tv?r't??sk?i]; b.
18 April 1873 in Warsaw – 19 June 1945 in Edinburgh, Scotland) was a Polish landowner and politician.
He belonged to a cadet branch of the Czetwertynski family, historically one of the princely houses of Poland and Lithuania.As a student in Riga, he studied at the Riga Technical University and was a member of the Polish student fraternity Arkonia.
He went on to become a member of the Russian Duma in 1906 and the Sejm from 1919 until 1935.
During World War II, he was a prisoner of Nazi Germany, and was interned at both the Buchenwald and Auschwitz concentration camps.
Married to Zofia Przezdziecka, their son Wlodzimierz (1907-1965) and elder grandchildren were born in Poland, but during World War II, they fled to Britain, eventually taking up residence in North America.