| Aleksej Demjanov | |
| Nationality: | Croatian |
| Sport: | Gymnastics |
| Birth Date: | 9 December 1973 |
| Birth Place: | Cherkessk, Russian SFSR, Soviet Union |
| Death Place: | Cherkessk, Russia |
Aleksej Demjanov (Russian: Алексей Николаевич Демьянов|Aleksey Nikolayevich Demyanov; 9 December 1973 – 8 August 2021) was a Croatian-Russian gymnast.[1] He competed at the 1996 Summer Olympics.[2]