Sergey Yefimovich Malov (Russian: Серге́й Ефи́мович Ма́лов; 28 January 1880, Kazan – 6 September 1957, Leningrad) was a Russian and Soviet Turkologist who made important contributions to the documentation of archaic and contemporary Turkic languages, classification of the Turkic alphabets, and the deciphering of the Turkic Orkhon script.