Arkady L'vovich Onishchik (Russian: Арка́дий Льво́вич Они́щик, born 14 November 1933[1] in Moscow; died 12 February 2019[2]) was a prominent Soviet and Russian mathematician, who worked on Lie groups and their geometrical applications.

Onishchik was a student of Eugene Dynkin,[3] under whose guidance he got his PhD at Moscow State University in 1960.

[1] In 1962 Onishchik received the Prize of the Moscow Mathematical Society for young mathematicians.

[1] In addition to Lie groups and algebras, Onishchik also worked on nonabelian cohomology and on supermanifolds.

B. Vinberg, V. V. Gorbatsevich, V. G. Durnev, R. Sulanke, L, S. Kazarin, D. A. Leites, V. V. Serganova, V. M. Tikhomirov.