| Ivan Sebastianovich Chernoknizhny | |
| Native Name: | Іван Себастьянович Чорнокнижний |
| Native Name Lang: | uk |
| Term Start: | 12 February |
| Term End: | 15 June 1919 |
| Predecessor: | Office established |
| Birth Date: | 1890s |
| Death Date: | 1928 |
| Mawards: | is not set --> |
| Awards: | is not set --> |
Ivan Sebastianovich Chernoknizhny was a left socialist-revolutionary and a leading member of the Makhnovist movement.
Ivan Chernoknizhny was born at the end of the nineteenth century in the Pavlohrad Raion of the Katerynoslav Governorate. After receiving his education, he worked as a rural teacher in the village of, where he became a member of the Party of Left Socialist-Revolutionaries. In the autumn of 1918, he joined the Makhnovist movement and was elected as a delegate for Novopavlivka to the first, second and third Regional Congresses of Peasants, Workers and Insurgents. At the second congress, he was elected as the first chairman of the Military Revolutionary Council (VRS), after he gave a speech in which he denounced the newly established Ukrainian Soviet Socialist Republic:
As chairman of the VRS, he oversaw the establishment of the first free soviets in Huliaipole Raion. During his speech at an opening ceremony in Huliaipole, he described the goal of the free soviets to be the establishment of self-governance in Ukraine, outside of the control of any political party. He also noted that Ukrainian peasants had instinctively self-organized many free soviets themselves, indicating widespread popular support for the project. He ended his speech by warning against rising authoritarianism, brought on by both the Bolsheviks and the White movement, calling instead for free soviets to become the nucleus for "real freedom, genuine equality and honest fraternity."
In June 1919, he was outlawed by the Soviet authorities and went underground. He continued to take an active part in the Makhnovist movement, constantly working in the VRS and remaining one of the ideologists of the insurgency. He was again declared an outlaw in January and November 1920. In the 1920s, after the amnesty, he lived in the Mezhova Raion of the Dnipropetrovsk Oblast, where he led the underground Anarcho-Makhnovist group. For his illicit activities, he was arrested in 1928.