The St. Petersburg Department of Steklov Institute of Mathematics of the Russian Academy of Sciences (Russian: Санкт-Петербургское отделение Математического института им. В. А. Стеклова РАН, abbreviated ПОМИ (PDMI) for "Петербургское отделение Математического института", Petersburg Department of the Mathematical Institute; PDMI) is a mathematical research institute in St. Petersburg, part of the Russian Academy of Sciences. Until 1992 it was known as Leningrad Department of Steklov Institute of Mathematics of the USSR Academy of Sciences (ЛОМИ, LOMI).