Marian Kamil Dziewanowski (May 1913, Zhytomyr – 18 February 2005, Milwaukee, Wisconsin) was a historian of Poland, Russia and modern Europe.
Born in Zhytomir, Russian Empire (now Ukraine), Dziewanowski grew up and studied in interwar Poland at the Jagiellonian University in Kraków. In 1937–39 he was a foreign correspondent in Berlin, covering the Anschluss with Austria, the Munich Conference, and the German occupation of the Sudetenland.
During the German invasion of Poland, Dziewanowski served as a Polish cavalry platoon leader. Later he served in England as an instructor/interpreter at a school for paratroopers and saboteurs, as an editor of a secret radio station working with the resistance in Poland, as a BBC news commentator, and, in Washington, as an aide to the Polish military attache. After the war, he chose to remain in exile rather than return to communist Poland.
He moved to the United States, where at Harvard University he earned one of the first postwar doctorates in Russian and East European history. He taught at Boston University, where he attained the rank of professor. From 1979 to 1984 he taught at the University of Wisconsin–Milwaukee.
He authored many articles and books on 19th- and 20th-century Polish and Russian history. He wrote important works on the political ideas of Józef Piłsudski, the most prominent Polish politician of the interbellum, and of the great 19th-century Polish and Russian politician, Prince Adam Jerzy Czartoryski.