OKB Chyetverikov was a Soviet aircraft design bureau headed by designer Igor Vyacheslavovich Chyetverikov at the TsAGI (Tsentrahl'nyy Aerodinamicheskiy i Ghidrodinamicheskiy Institoot- central aerodynamics and hydrodynamics institute) Menzhinskii factory in 1931 in order to produce flying boat designs.