Ivan Bubnov
| Ivan Grigoryevich Bubnov | |
|---|---|
| Ivan Bubnov | |
| Native name | Иван Григорьевич Бубнов | 
| Born | January 18, 1872 Nizhny Novgorod, Nizhegorodsky Uyezd, Nizhny Novgorod Governorate, Russian Empire | 
| Died | March 13, 1919 (aged 47) Petrograd | 
| Allegiance | Russian Empire | 
| Service | Imperial Russian Navy | 
| Years of service | 1907–1917 | 
| Rank | Major general of the Corps of Naval Constructors | 
Ivan Grigoryevich Bubnov (Russian: Ива́н Григо́рьевич Бу́бнов; 18 January 1872 – 13 March 1919) was a Russian naval engineer and mathematician who became the chief designer of submarines for the Imperial Russian Navy. He was responsible for designing most submarines of the Russian Navy before the Russian Revolution of 1917.