Mikhail Aleksandrovich Menzbier (Russian: Михаил Александрович Мензбир; 23 October 1855 – 10 October 1935) was a Russian and Soviet ornithologist. He was a professor of comparative anatomy at the Moscow University and promoted an evolutionary view of faunistics in the Soviet Union. He also studied the birds of prey, published a textbook of zoology, and a two volume work on the birds of Russia.