Igor Markovich Yefimov or Igor Efimov (Russian: ?´???? ??´?????? ???´???; born August 8, 1937, Moscow) is an American philosopher, historian, writer and publisher of Russian origin.
Some of his works were published under the pen name Andrei Moscovit.
Together with Boris Vakhtin, Sergei Dovlatov, Vladimir Gubin, and Vladimir Maramzin, he founded the Leningrad writers' group "Townspeople" (Gorozhane), whose works circulated in samizdat.
He is also the founder of Hermitage Publishers; a company specializing in Russian writers.