Iskhak Abdulovich Akhmerov (Russian: Исха́к Абду́лович Ахме́ров, Tatar Cyrillic: Исхак Габдулла улы Әхмәров, Latin: İsxaq Ğabdulla ulı Əxmərov; Troitsk, located in modern Chelyabinsk Oblast, 1901–1975) was a Soviet spy of Tatar ethnicity who joined the Bolshevik Party in 1919. Akhmerov attended the Communist University of Toilers of the East and the First State University, where he graduated from the School of International Relations in 1930. Akhmerov joined the OGPU/NKVD in 1930 and participated in the suppression of anti-Soviet movements in the USSR's Bukhara Republic between 1930 and 1931. Akhmerov spoke Turkish, English and French. His wife, an American who worked for Soviet intelligence, was Helen Lowry (Elza Akhmerova), the niece of the CPUSA General Secretary Earl Browder.
In 1932 Akhmerov transferred to the foreign intelligence of the NKVD and served as a covert intelligence officer under diplomatic cover in Turkey. He became a covert field officer serving in China in 1934. In 1935 he entered the United States with false identity papers and served until 1939. Akhmerov returned in 1942 and served as covert resident in the United States during World War II and operated under cover as a clothier. Akhmerov is known to have used the cover names William Grienke, Michael Green, Michael Adamec, and several others while in the United States. His code names in intercepted Venona decrypts of Soviet intelligence messages are MAYOR and ALBERT.
In late 1945 or early 1946 Akhmerov returned to the Soviet Union and became deputy chief of the KGB's covert intelligence section (отдел нелегальной разведки). He attained the rank of colonel and was awarded the Order of the Red Banner twice, the Order of the Badge of Honor, and the badge of Honored Chekist.