List of Famous people who died in 1931

Aleksandr Andreyevich Tikhomirov was a Russian zoologist. After graduating in the Saint Petersburg University and the Moscow University, Tikhomirov became a Professor of the latter and the director of the zoological museum attached to it. His major works, containing anti-darwinism, concern the anatomy, embryology and the physiology of silkworm. In 1886 Tikhomirov discovered the artificial parthenogenesis on the silkworm's grain.

Yefim Fyodorovich Karskiy was a Belarusian-Russian linguist-Slavist, ethnographer and paleographer, founder of Belarusian linguistics, literary studies and paleography, a member of numerous scientific institutions, and author of more than 100 works on linguistics, ethnography, paleography and others.

Dwight Whitney Morrow was an American businessman, diplomat, and politician of Scots-Irish descent, best known as the U.S. ambassador who improved U.S.-Mexican relations, mediating the religious conflict in Mexico known as the Cristero rebellion (1926–29), but also contributing to an easing of conflict between the two countries over oil. The Morrow Mission to Mexico was an "important step in the 'retreat from imperialism'". He was the father of Anne Morrow and father-in-law of Charles A. Lindbergh.

Melville Louis Kossuth "Melvil" Dewey was an American librarian and educator, inventor of the Dewey Decimal system of library classification, and a founder of the Lake Placid Club. He resigned from the American Library Association due to allegations of sexual harassment, racism, and antisemitism in 1905.

Johannes Paulus Lotsy or Jan Paulus Lotsy was a Dutch botanist, specializing in evolution and heredity. He promoted the idea of evolution being driven by hybridization.