Ivan Grigoryevich Bubnov (; 18 January 1872 - 13 March 1919) was a Russian marine engineer and designer of submarines for the Imperial Russian Navy. Bubnov was born in Nizhny Novgorod and graduated from the Marine Engineering College in Kronstadt in 1891. He graduated from the Nikolayev Marine Academy in 1896. He initially joined the Admiralty Shipyard in Saint Petersburg and worked as a constructor on the battleship Poltava. * Kasatka class * Minoga * Akula * Morzh class * Bars class Bubnov died of typhoid in Petrograd in 1919.