• Workshop "C*-ALGEBRAS AND TENSOR CATEGORIES", Cortona, Italy, August 30 - September 3, 1999, organized by Sergio Doplicher.
• MATHEMATICAL PHYSICS IN MATHEMATICS AND PHYSICS. QUANTUM AND OPERATOR ALGEBRAIC ASPECTS. Certosa di Pontignano Siena, June 20-25, 2000, organized by C. D'Antoni, F. Fidaleo, T. Isola, R. Longo, C. Pinzari, L. Zsido, W. Bergmann, D. Guido, V. Millucci.
• NONCOMMUTATIVE GEOMETRY C.I.M.E. course, Martina Franca, Italy, 03/09-10/09/2000. organized by S. Doplicher and R. Longo.
• Special Session OPERATOR ALGEBRAS of the First AMS-UMI joint Meeting, Pisa, June 12-16, 2002, organized by S. Doplicher and E. Effros.
• INDEX THEOREMS AND MODULARITY IN OPERATOR ALGEBRAS Oberwolfach, Germany, 23 - 29.06.2002, organized by K. Fredenhagen, R. Longo, and K-H. Rehren, Göttingen.
• Mini-Workshop ALGEBRAIC ASPECTS OF QUANTUM PHYSICS. Roma Tor Vergata, September 26, 2002.
• Mini-Workshop C*-ALGEBRAS AND TENSOR CATEGORIES. Roma Tor Vergata, October 23, 2002.
• Mini-Workshop NONCOMMUTATIVE DYNAMICAL SYSTEMS AND GEOMETRY. Roma Tor Vergata, November 20, 2002.
• Mini-Workshop CATEGORIES AND C*-ALGEBRAS. Roma Tor Vergata, January 15, 2003.
• Mini-Workshop CONFORMAL FIELD THEORY. AN INTRODUCTION. Roma Tor Vergata, March 26-28, 2003.
• Mini-Workshop TOPICS IN OPERATOR ALGEBRAS. Roma Tor Vergata, March 16-17, 2005.
• Conference RECENT ADVANCES IN OPERATOR ALGEBRAS On the occasion of the 60th birthday of Laszlo Zsido. Rome, November 8-11, 2006
• Special Session OPERATOR ALGEBRAS of the joint International Meeting UMI-DMV, Perugia 18-22 June 2007, organized by Claudio D'Antoni and Roland Speicher.
• 1^st FRENCH-ITALIAN MEETING ON NONCOMMUTATIVE GEOMETRY. Inaugural Meeting of the GREFI-GENCO. Rome, November 23-25, 2007, organized by Daniele Guido and Jean-Luc Sauvageot.
• QUANTUM SPACETIME AND NONCOMMUTATIVE GEOMETRY. Rome, September 29 - October 4, 2008. Organizing Committee: Sergio Doplicher, Daniele Guido, Roberto Longo, Gerardo Morsella, Gherardo Piacitelli.
• NONCOMMUTATIVE GEOMETRY AND QUANTUM FIELD THEORY. Rome, October 3-7, 2008. Organizing Committee: C. D'Antoni, S. Doplicher, D. Guido, R. Longo, G. Morsella, G. Piacitelli, J.E. Roberts, L. Zsido.
• NONCOMMUTATIVE GEOMETRY AND QUANTUM PHYSICS Vietri sul Mare, August 31 - September 5, 2009. Scientific Committee: F.Cipriani, S.Doplicher, D.Guido, G.Landi, R.Longo, P.Piazza, J-L.Sauvageot. Organizing Committee: D.Guido, G.Landi, F.Lizzi, G.Marmo, G.Morsella, G.Ruzzi, G.Vilasi.