Jan Józef Graliński (February 8, 1895 – January 9, 1942) was chief of the Polish General Staff's interbellum Cipher Bureau's Russian section, B.S.-3. After Poland was overrun by the Germans and Soviets in September 1939, Graliński managed, along with other Cipher Bureau personnel, to reach Paris, France. He became part of the reconstituted Polish cryptologic unit that was housed during the "Phony War" in the Château de Vignolles, codenamed PC Bruno, at Gretz-Armainvillers, some forty kilometers northeast of Paris.