Alexander S. Vucinich (October 23, 1914 – May 25, 2002) was an American historian. He taught at the department of history and sociology of science at the University of Pennsylvania from 1976 until his retirement in 1985. He also taught at San Jose State College (1950–64), the University of Illinois (1964–70), and the University of Texas (1970–76). After his retirement he and his wife Dorothy moved to Berkeley, California, where he participated in the activities of Berkeley's Institute of Slavic, East European, and Eurasian Studies. His field of research was the history of science and social thought in Russia and the Soviet Union.