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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1918 | 30 may | Republic | Avetis Aharonyan | Hovhannes Kacharznuni |
| 1919 | 28 may | Aleksandr I. Khatisyan | ||
| 1920 | 5 may | Hamazasp Ohandzhanyan |
| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1920 | 29 november | Soviet Socialist Republic | Sarkis Kasyan | Simeon Vratsyan |
| 1921 | 21 may | Aleksandr Miasnikyan | ||
| 1922 | 2 february | Sarkis Ambartsumyan | ||
| 1922 | 12 march | State of Transcaucasian Federation | ||
| 1936 | 5 december | 10° Socialist Republic of URSS | Gevorg S. Anesoglyan | Abram A. Guloyan |
| 1937 | 23 november | Matsak Petrosovich Papyan | Aram Sergeyevich Piruzyan | |
| 1945 | Agasi Solomonovich Sarkisyan | |||
| 1947 | 31 march | Saak Karapetovich Karapetyan | ||
| 1949 | Shmalon Minasovich Arusanyan |
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| YEAR | DATE | EVENT | PRESIDENT | PRIME MINISTER |
| 1952 | 17 december | Anton Ervandovich Kochinyan | ||
| 1954 | may | Shmalon Minasovich Arushanyan | ||
| 1963 | april | Nagush Khachaturovich Arutyunyan | ||
| 1966 | february | Badal Amayakovich Muradyan | ||
| 1972 | november | Grigory Agafonovich Arzumanyan | ||
| 1975 | 3 july | Babken Yesayevich Sarkisov | ||
| 1977 | 17 january | Fadey Tachatovich Sarkisyan | ||
| 1985 | december | Grant Mushegovich Voskanyan | ||
| 1990 | 4 august | Republic of URSS | Levon Akopovich Ter-Petrosyan | Fadey Tachatovich Sarkisyan |
| 1990 | 13 august | Vazgen Manukyan |