Alexander Davidovich Goldfarb (a.k.a. Alex Goldfarb, Russian: Александр Давидович Гольдфарб; born 1947 in Moscow) is a Russian-American microbiologist, activist, and author. He emigrated from the USSR in 1975 and studied in Israel and Germany before settling permanently in New York in 1982. Goldfarb is a naturalized American citizen. He has combined a scientific career as a microbiologist with political and public activities focused on civil liberties and human rights in Russia, in the course of which he has been associated with Andrei Sakharov, George Soros, Boris Berezovsky, and Alexander Litvinenko. He has not visited Russia since 2000.