| Gavriil Beljagin | |
| Image Upright: | 0.90 |
| Office1: | Deputy mayor of Tallinn |
| Term Start1: | April 1917 |
| Term End1: | September 1917 |
| Predecessor1: | Jaan Poska |
| Successor1: | Voldemar Vöölmann (as chairman of city government) |
| Birth Date: | 22 April 1870 |
| Death Place: | Tallinn, Estonia |
Gavriil Filippovich Beljagin (also went by Gabriel; Russian: Гавриил Филиппович Белягин; 22 April 1870 – 9 August 1936) was a Russian-Estonian politician who was the deputy mayor of Reval (now Tallinn) from April 1917 to September of that year. He was the city's commissioner until he was selected by then mayor Jaan Poska to serve as deputy mayor in April 1917, when Poska went on to become the commissar of the Autonomous Governorate of Estonia. Beljagin oversaw the establishment of Estonian as the official language of Reval. He resigned just before the October Revolution and the start of the Russian Civil War in late 1917.[1] He was succeeded by Voldemar Vöölmann as the chairman of city government. He later died on 9 August 1936 and is buried at Siselinna Cemetery.[2]