Nikolai Alekseievich Gladkov (Russian: Николай Алексеевич Гладков; 20 March 1905 – 31 October 1975) was a Soviet ornithologist born in Russia.
He published a multi-volume work on the birds of the Soviet Union along with G P Dementiev and was a winner of the Stalin Prize of 1952.
He was a senior researcher at the Zoological Museum of the Moscow State University from 1934 and in 1938 he received a degree in biological sciences without presentation of a thesis.
In 1941 he took part in the Great Patriotic War (WW II) where he was a weapons logistics commander and a sergeant.
Gladkov was moved to France towards the end of the war and he sent Stresemann a couple of cigarettes to show his gratitude.
He married Tatiana Dmitrievna Gladkova (born Chumakova), a fingerprint expert at the Anthropology Museum of the Moscow State University, in 1949.