The Shirshov Institute of Oceanology (P.P. Shirshov Institute of Oceanology (SIO) RAS, Russian: Институт океанологии им. П. П. Ширшова РАН) in Moscow, is the premier research institution for ocean and earth science in Russia, established in 1946. It is part of the Russian Academy of Sciences.
The institute is named after Pyotr Shirshov, who founded it in 1946. Amongst others, Andrei Monin served as director.
Coordinates: 55°40′37″N 37°34′08″E / 55.67694°N 37.56889°E