Sergey Ivanovich Ognev (Russian: Серге́й Ива́нович Огнёв) (17 November 1886 in Moscow – 20 December 1951 in Moscow) was a scientist, zoologist and naturalist, remembered for his work on mammalogy. He graduated from Moscow University in 1910, the same year in which he published his first monograph. In 1928, he became a professor at the Moscow State Pedagogical University. He published a variety of textbooks in zoology and ecology. His magnum opus, Mammals of Russia and adjacent territories, was never completed.^[1]

He is remembered in the species names of three mammals: Talpa ognevi, Cnephaeus ognevi, and Plecotus ognevi, and the common name of Ognev's Mouse-tailed Dormouse.^[2]