Boris Fyodorovich Porshnev (Russian: Бори́с Фёдорович По́ршнев; 7 March [O.S. 22 February] 1905, in Saint Petersburg – 26 November 1972, in Moscow) was a Soviet historian known for his works on popular revolts in Ancien Régime France and a doctor of philosophical and historical sciences, working on psychology, prehistory, and neurolinguistics as relating to the origins of man.