| Oleg Yesayan | |
| Office: | Prime Minister of Nagorno-Karabakh |
| Term Start: | 8 January 1992 |
| Term End: | August 1992 |
| Predecessor: | position established |
| Successor: | Robert Kocharyan |
| Office1: | President of the National Assembly of Nagorno-Karabakh |
| Term Start1: | 2 December 1997 |
| Term End1: | 1 July 2005 |
| President1: | Arkadi Ghukasyan |
| Predecessor1: | Arthur Tovmasian |
| Successor1: | Ashot Ghulian |
| Office2: | Chairman of the Securities Commission of Armenia |
| Term Start2: | 2005 |
| Term End2: | 2006 |
| President2: | Serzh Sargsyan |
| Birth Date: | 1946 11, df=yes |
| Birth Place: | Sos, Nagorno-Karabakh, Azerbaijan SSR, Soviet Union |
| Party: | Independent |
| Alma Mater: | Yerevan State University |
| Occupation: | Economist |
Oleg Yesayan (Armenian: Օլեգ Եսայան; born 12 November 1946) is an Armenian politician and diplomat who is a former Prime Minister of Nagorno-Karabakh, President of the National Assembly of Nagorno-Karabakh, and Chairman of the Securities Commission of Armenia. Yesayan is also a former Ambassador of Armenia to Russia and Belarus, presenting his credentials to Russian President Dmitry Medvedev on 5 February 2010.[1] [2] [3]