| | 1929 | Kharkov | USSR | Quantum Physics | Conference |
| Jan | 1934 | Moscow | USSR | | I All-Union Astronomic-Geodesic Congress |
| Aug 11-18 | 1948 | Zurich | Switzerland | | IAU GA VII |
| | 1950 | Paris | France | Astronomical Constants | International Conference |
| | 1950 | Stockholm | Sweden | | Session of the IAU Executive Committee |
| Apr 16-19 | 1951 | Moscow | USSR | Problems of Cosmogony | First Conference on Problems of Cosmogony |
| Nov 12-16 | 1951 | Byurakan | USSR | Stellar Associations and the Distribution of Hot Giants | First Conference in Byurakan |
| | 1951 | Paris | France | | Session of the IAU Executive Committee |
| May 19-22 | 1952 | Moscow | USSR | Problems of Cosmogony | Second Conference on Problems of Cosmogony |
| | 1952 | Vienna | Austria | | Peoples Congress for Defense of Peace |
| Sep 4-13 | 1952 | Rome | Italy | | IAU GA VIII |
| | 1952 | Pulkovo | USSR | | 10th All-Union Astronomical Conference |
| May 14-15 | 1953 | Moscow | USSR | Problems of Cosmogony | Third Conference on Problems of Cosmogony |
| Jun 17-22 | 1953 | Groningen | Netherlands | Coordination of Studies on the Galactic Structure | IAU Symposium #1 |
| Jun 29 – Jul 3 | 1953 | Paris | France | The Fundamental Problems of the Stellar Classification | International Astronomical Conference |
| | 1953 | Liege | Belgium | Dust in the Astronomical Objects | V Liege International Astrophysical Symposium |
| Oct 26-29 | 1954 | Moscow | USSR | Problems of Cosmogony | Fourth Conference on Problems of Cosmogony |
| | 1954 | Liege | Belgium | Solid Particles in Cosmic Objects | VI Liege international astrophysical symposium |
| | 1955 | Moscow | USSR | | II Congress of the All-Union Astronomic-Geodesic Society (VAGO) |
| | 1955 | Helsinki | Finland | | World Assembly of Supporters of Peace |
| Mar 9-12 | 1956 | Moscow | USSR | Problems of Cosmogony | Fifth Conference on Problems of Cosmogony |
| Sep 20-22 | 1956 | Byurakan | USSR | Non-Stable Stars | Symposium, Dedicated to the Official Inauguration of the Byurakan Astrophysical Observatory |
| | 1957 | Vienna, Innsbruk, Graz | Austria | | Annual meeting of the Academy |
| Jun 5-7 | 1957 | Moscow | USSR | Problems of Cosmogony | Sixth Conference on Problems of Cosmogony |
| | 1957 | Cambridge | USA | Cosmic Gas Dynamics | III Symposium on Cosmic Gas Dynamics |
| Aug 12-20 | 1958 | Moscow | USSR | | IAU GA X |
| | 1958 | Bruxelles | Belgium | Problems of Large Universe | XI Solvay Conference |
| | 1958 | Yerevan | USSR | Theory of Probability and Mathematical Statistics | All-Union Conference on the Theory of Probability and Mathematical Statistics |
| | 1958 | Moscow | USSR | Philosophical Problems of the Natural Science | All-Union Conference on the Philosophical Problems of the Natural Science |
| | 1959 | Delhi | India | | National Science Congress of India |
| Aug 10-12 | 1961 | Santa-Barbara, CA | USA | Problems of Extragalactic Research | IAU Symposium #15 |
| Aug 15-24 | 1961 | Berkeley, CA | USA | | IAU GA XI |
| | 1962 | Yerevan | USSR | | IAU Executive Council Meeting |
| Mar 18-28 | 1963 | Canberra | Australia | The Galaxy and the Magellanic Clouds | IAU Symposium #20 |
| Mar | 1963 | Bandung | Indonesia | Standards for Stellar Photometry and Spectral Classification | Symposium |
| | 1963 | Prague | Czechoslovakia | | Session of the ICSU Executive Committee |
| May 20-23 | 1964 | Byurakan | USSR | Extraterrestrial Civilizations | First All-Union Conference on the Problem of Extraterrestrial Civilizations |
| Aug 25 – Sep 3 | 1964 | Hamburg | FRG | | IAU GA XII |
| | 1964 | Bruxelles | Belgium | Problems of Structure and Evolution of Galaxies | XIII Solvay conference |
| Apr 20-28 | 1965 | Tbilisi | USSR | Problems of Gravitation | Second Soviet Gravitational conference |
| Oct | 1965 | Riga | USSR | | V Congress of the All-Union Astronomic-Geodesic Society (VAGO) |
| May 4-12 | 1966 | Byurakan | USSR | Non-Stable Phenomena in Galaxies | IAU Symposium #29 |
| | 1966 | Bombay | India | | Session of the ICSU Executive Council |
| Aug 22-31 | 1967 | Prague | Czechoslovakia | | IAU GA XIII |
| | 1967 | Rome | Italy | | Session of the ICSU Executive Committee |
| | 1968 | Vienna | Austria | | XIV International Philosophic Congress |
| | 1968 | Paris | France | | ICSU General Assembly |
| Aug 18-27 | 1970 | Brighton | UKա | | IAU GA XIV |
| | 1970 | Rome | Italy | The Nuclei of Galaxies | Symposium |
| | 1970 | Madrid | Spain | | ICSU General Assembly |
| | 1970 | Moscow | USSR | Philosophical Problems of the Natural Science | II All-Union Conference on Philosophical Problems of the Natural Science |
| Sep 6-11 | 1971 | Byurakan | USSR | The Problem of Extraterrestrial Civilizations and Communication with them | First international (Soviet-American) symposium on the Problem of Extraterrestrial Civilizations and Communication with them |
| Aug 31 - Sep 3 | 1971 | Bamberg | FRG | New Directions and New Frontiers in Variable Star Research | IAU Col. #15 |
| | 1972 | Helsinki | Finland | | ICSU General Assembly |
| Sep-04 | 1973 | Torun, Warsaw, Krakov | Poland | | IAU Extraordinary GA, Devoted to the 500th Anniversary of Copernicus |
| | 1973 | Moscow | USSR | | General Meeting of the USSR Acad. Sci., Devoted to the 500th Anniversary of Copernicus |
| Jul 29 - Aug 4 | 1974 | Moscow | USSR | Variable Stars and Stellar Evolution | IAU Symposium #67 |
| Jul 1-5 | 1975 | Tbilisi | USSR | | 3rd European Regional IAU Meeting |
| | 1975 | Berlin | FRG | | Celebrations of the 275th anniversary of the German Acad. Sci. in Berlin |
| | 1975 | Moscow | USSR | Problems of Philosophical Struggle in Modern Natural Science | Conference |
| May | 1976 | Abastumani | USSR | | 2nd Joint Colloquium of the Byurakan and Abastumani (Georgia) Astrophysical Observatories |
| Oct 5-8 | 1976 | Byurakan | USSR | Flare Stars | International Symposium, Dedicated to Official Opening of the 2.6 m Telescope |
| Sep 12-16 | 1977 | Tallinn | USSR | The Large Scale Structure of the Universe | IAU Symposium #79 |
| May | 1978 | Abastumani | USSR | | 4th Joint Colloquium of the Byurakan and Abastumani (Georgia) Astrophysical Observatories |
| | 1978 | Crimea | USSR | Non-Stable Stellar Objects | Joint Colloquium of the USSR Acad. Sci. Astronomical Council and the Byurakan Astrophysical Observatory |
| Nov 1-3 | 1978 | Byurakan | USSR | | Plenum of the Astronomical Council of the USSR Academy of Sciences |
| | 1978 | Dusseldorf | FRG | | International Philosophical Symposium |
| | 1979 | Berlin, Potsdam, Jena | FRG | | Session of the Academy of Sciences, Devoted to the 100th Anniversary of Albert Einstein |
| May 22-24 | 1979 | Byurakan | USSR | Flare Stars, Fuors and Herbig-Haro Objects | Symposium of the Multilateral Research Cooperation of the Academies of Sciences of the Socialist Countries on the Problem of "Stellar Physics and Evolution" |
| | 1979 | Dubna | USSR | Theoretical and Mathematical Physics | Symposium Devoted to the 70th Anniversary of Academician N.N. Bogolyubov |
| | 1980 | Samos island | Greece | | Symposium Devoted to the 2000th Anniversary of Aristarch from Samos |
| Jul 22-25 | 1980 | Kyoto | Japan | Fundamental Problems in the Theory of Stellar Evolution | IAU Symposium #93 |
| | 1980 | Moscow | USSR | | Meeting Dedicated to 1500th Anniversary of Davit the Invincible |
| Jun 9-14 | 1981 | Byurakan | USSR | | IV Soviet-Finnish Astronomical Meeting (Conference on Various Problems of Galactic and Extragalactic Astronomy) |
| Oct 26-30 | 1981 | Byurakan | USSR | Principle of Invariance and its Applications | All-Union Symposium Dedicated to the 40th Anniversary of the Introduction of the Principle of Invariance by V.A. Ambartsumian to the Radiation Transfer Theory |
| | 1981 | Moscow | USSR | Philosophical Problems of Modern Natural Science | III All-Union conference on Philosophical Problems of Modern Natural Science |
| | 1981 | Leningrad | USSR | | Conference Dedicated to the 100th Anniversary of the Astronomical Observatory of the LSU |
| May | 1982 | Tbilisi | USSR | | 6th Joint Colloquium of the Byurakan and Abastumani (Georgia) astrophysical observatories |
| Aug 17-26 | 1982 | Patras | Greece | | IAU GA XVIII |
| | 1982 | Moscow | USSR | | Annual Meeting of the USSR Academy of Sciences |
| Feb 24-26 | 1983 | Tonanzintla, Mexico City | Mexico | Herbig-Haro Objects, T Tauri Stars and Related Phenomena | Symposium Dedicated to Guillermo Haro |
| Nov28 - Dec 3 | 1983 | Buenos Aires | Argentina | | 3rd Latin-American Regional IAU Meeting (LARIM) |
| | 1984 | Leningrad | USSR | | Jubilee Conference Dedicated to the 50th Anniversary of the LSU Chair of Astrophysics |
| Oct 16-19 | 1984 | Byurakan | USSR | Flare Stars and Related Objects | International Symposium |
| Nov | 1984 | Abastumani | USSR | | 8th Joint Colloquium of the Byurakan and Abastumani (Georgia) Astrophysical Observatories |
| Jun 3-7 | 1986 | Byurakan | USSR | Observational Evidence of Activity in Galaxies | IAU Symposium #121 |
| Sep 22-28 | 1987 | Byurakan | USSR | Observations with Large Telescopes | International School for Young Astronomers, organized jointly by ESO and the Byurakan Observatory |
| Oct 23-27 | 1989 | Byurakan | USSR | Flare Stars in Star Clusters, Associations and the Solar Vicinity | IAU Symposium #137 |
