The St. Petersburg Department of Steklov Institute of Mathematics of the Russian Academy of Sciences (, 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). The name of the institution is a historical tradition and since 1995 it has no subordination to the Steklov Institute of Mathematics. The institute was established in 1940 as a department of the Steklov Institute and is named after Vladimir Andreevich Steklov, a Soviet/Russian mathematician, mechanician and physicist.

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