Ալբերտ Պետրոսյան

 XI All-Union school on Operators Theory  in Functional Spaces, Chelyabinsk (May 26-30,1986).
 Workshop on Theory of Functions, Yerevan(1987), 

 The Conference of universities of the Transcaucasian republics, Tbilisi(1987).

 International ISAAC Conference on Complex Analysis, Differential Equations and Related Topics, Yerevan, Armenia (September 17-21, 2002).

 International Conference "Mathematics in Armenia", Tsahkadzor, Armenia ( September 30-October 7, 2003).

 International conference "Harmonic Analysis and Approximations, III",  Tsahkadzor, Armenia (September 20-27, 2005).

 International Conference dedicated to the centennial of S. M. Nikolskii, Moscow, (May 23-29, 2005).

 The Conference dedicated to 90th birthday of H. V. Badalyan, Yerevan, (June 22-24, 2006).

 The Conference dedicated to 80th birthday of S. N. Mergelyan, Yerevan, (May 20-21, 2008).

 International Conference "Harmonic Analysis and Approximations, IV", dedicated to 80th birthday of Alexandr Talalian, Tsahkadzor, Armenia (September 19-25, 2008).

 The Conference dedicated to 90th birthday of M. M. Djrbashian, Yerevan, (November 27-28, 2008).

  The Third Russian-Armenian workshop on mathematical physics, complex analysis and related topics, Tsaghkadzor, Armenia (4- 8 October, 2010).

 International Conference "Harmonic Analysis and Approximations, V" dedicated to 75th birthday of Norair Arakelian, Tsahkadzor, Armenia (September 10-17, 2011). 

  Second International Conference "Mathematics in Armenia", Tsahkadzor, Armenia ( August 24-31, 2013).