- International ones
- Subfactors, the 32nd Taniguchi Symposium, Katata, Japan, July 6-10, 1993.
- Modular Invariance, ADE, Subfactors and Geometry of Moduli Spaces, Kyoto¡¤Japan, November 26-December 2, 2000
- Subfactors & Algebraic Aspects of Quantum Field Theory, MSRI, Berkeley, U.S.A., December 4-8, 2000.
- Recent Advances in von Neumann Algebras, UCLA, U.S.A., May 14-17, 2003.
- Takagi Lectures
- The first Takagi Lectures, Kyoto, Japan, November 25-26, 2006.
- The second Takagi Lectures, Tokyo, Japan, May 26, 2007.
- The third Takagi Lectures, Tokyo, Japan, November 23, 2007.
- The fourth Takagi Lectures, Kyoto, Japan, June 21, 2008.
- The fifth Takagi Lectures, Tokyo, Japan, October 4-5, 2008.
- The sixth Takagi Lectures, Sapporo, Japan, June 6-7, 2009.
- The seventh Takagi Lectures, Tokyo, Japan, November 21-23, 2009.
- The eighth Takagi Lectures, Kyoto, Japan, November 23, 2010.
- The ninth Takagi Lectures, Kyoto, Japan, June 4, 2011.
- The tenth Takagi Lectures, Kyoto, Japan, May 26, 2012.
- The eleventh Takagi Lectures, Tokyo, Japan, November 17-18, 2012.
- The twelfth Takagi Lectures, Tokyo, Japan, May 25-26, 2013.
- The thirteenth Takagi Lectures, Kyoto, Japan, November 16-17, 2013.
- The fourteenth Takagi Lectures, Tokyo, Japan, November 15-16, 2014.
- The fifteenth Takagi Lectures, Sendai, Japan, June 27-28, 2015.
- The sixteenth Takagi Lectures, Tokyo, Japan, November 28-29, 2015.
- The seventeenth Takagi Lectures, Kyoto, Japan, June 18, 2016.
- The eighteenth Takagi Lectures, Tokyo, Japan, November 5-6, 2016.
- The nineteenth Takagi Lectures, Kyoto, Japan, July 8-9, 2017.
- The twentieth Takagi Lectures, Tokyo, Japan, November 4, 2017.
- The twenty-first Takagi Lectures, Kyoto, Japan, June 23, 2018.
- The twenty-second Takagi Lectures, Tokyo, Japan, November 17-18, 2018.

- Arbeitsgemeinschaft, Algebraic Structures in Conformal Field Theories, Oberwolfach, Germany, April 1-7, 2007.
- Program:
Operator Algebras and Conformal Field Theory,
Erwin Schrödinger Institute, Austria,
August 25-December 14, 2008.
- Workshop: Operator Algebras, Conformal Field Theory and Related Topics, Erwin Schrödinger Institute, Austria, September 8-19, 2008.

- French-Japanese Scientific Forum, the University of Tokyo and Keio University, Japan, October 7-9, 2008.
- GCOE Workshop on Operator Algebras, the University of Tokyo, Japan, January 28-29, 2009.
- "Mathematics: From Today to Tomorrow" -- Global COE Opening Symposium at Tokyo -- , the University of Tokyo, Japan, January 30-February 1, 2009.
- Special Session on Operator Algebras, 5th Asian Mathematical Conference, Kuala Lumpur, Malaysia, June 22-26, 2009.
- RIMS International Project Research 2011
"Operator Algebras and their Applications",
RIMS,
Kyoto University, Japan, April 2011-March 2012.
- Conference on C*-Algebras and Related Topics, RIMS, Kyoto University, Japan, September 5-9, 2011.
- Operator Algebras and Mathematical Physics, Kansai Seminar House, Japan, October 25-28, 2011.
- Winter School on Operator Algebras, RIMS, Kyoto University, Japan, December 7-16, 2011.
- Conference on von Neumann Algebras and Related Topics, RIMS, Kyoto University, Japan, January 9-13, 2012.

- Session "Conformal Field Theory" at The XXIX International Colloquium on Group-Theoretical Methods in Physics, Chern Institute of Mathematics, Tianjin, China, August 2012.
- Miniworkshop on Operator Algebras I, II, III, IV, V, the University of Tokyo, Japan, January 11, 16, 30, March 11, 15, 2013
- Workshop on Operator Algebras, the University of Tokyo, Japan, May 10-12, 2013
- Session "Functional Analysis and Applications", Asian Mathematical Conference 2013, Busan, Korea, June 30-July 4, 2013.
- East Asian Core Doctorial Forum on Mathematics, Kyoto University, Japan, January 20-24, 2014
- Kavli IPMU-FMSP Workshop "Supersymmetry in Physics and Mathematics", Kavli IPMU (WPI), the University of Tokyo, Japan, March 10-20, 2014.
- The Second China-Japan Conference on Noncommutative Geometry and K-Theory, Naha, Japan, October 4-7, 2014.
- East Asian Core Doctorial Forum on Mathematics, National Taiwan University, Taiwan, January 19-22, 2015
- Subfactors and Conformal Field Theory, Oberwolfach, Germany, March 23-27, 2015.
- International Conference on Non-commutative Geometry and K-Theory, Chongqing, China, December 18-21, 2015.
- East Asian Core Doctorial Forum on Mathematics, Fudan University, China, January 8-12, 2016.
- MSJ-SI "Operator Algebras and Mathematical Physics",Tohoku University, Japan, August 1-12, 2016.
- Berkeley-Tokyo Autumn School --- Quantum Field Theory and Subfactors, UC Berkeley, U.S.A., November 14-23, 2016.
- East Asian Core Doctoral Forum on Mathematics, Seoul National University, Korea, January 6-10, 2017.
- Subfactors, K-theory and Conformal Field Theory, Isaac Newton Institute for Mathematical Sciences, England, June 12-16, 2017.
- East Asian Core Doctoral Forum on Mathematics, Tsinghua University, China, January 12-16, 2018.
- Noncommutative Geometry and K-theory at Rits -The Fourth China-Japan Conference-, Ritsumeikan University, Japan, March 26-28, 2018.
- Subfactors and Applications, Oberwolfach, Germany, October 27-November 2, 2019.

- Domestic ones
- Topics Related to Operator Algebras, Tokyo, Japan, February 19-21, 1997.
- Summer School "Mathematical Physics"
- Noncommutative Geometry and Mathematical Physics, Summer School: Mathematical Physics 2002, Tokyo, Japan, September 21-23, 2002.
- Mathematics of Fluid Dynamics and Turbulence, Summer School: Mathematical Physics 2003, Tokyo, Japan, September 6-9, 2003.
- Vertex operator algebras and the Monster, Summer School: Mathematical Physics 2004, Tokyo, Japan, August 21-24, 2004.
- Random matrices, Summer School: Mathematical Physics 2005, Tokyo, Japan, September 3-6, 2005.
- Mathematics and Physics around the Bose-Einstein condensation, Summer School: Mathematical Physics 2007, Tokyo, Japan, August 18-21, 2007.
- Differential geometry and topology of Ricci flows, Summer School: Mathematical Physics 2008, Tokyo, Japan, September 27-30, 2008.
- Mathematics of Power Laws, Summer School: Mathematical Physics 2009, Tokyo, Japan, August 27-30, 2009.
- Random Schrödinger operators, Summer School: Mathematical Physics 2010, Tokyo, Japan, August 26-29, 2010.
- New developments of integrable systems, Summer School: Mathematical Physics 2011, Tokyo, Japan, August 25-28, 2011.
- Mathematics and Physics of Knots, Summer School: Mathematical Physics 2012, Tokyo, Japan, September 7-9, 2012.
- Mathematics of Quantum Fields, Summer School: Mathematical Physics 2013, Tokyo, Japan, September 28-30, 2013.
- Mathematics of Topological Phase, Summer School: Mathematical Physics 2014, Tokyo, Japan, August 29-31, 2014.
- Holographic Principle and Quantum Entanglement, Summer School: Mathematical Physics 2015, Tokyo, Japan, August 28-30, 2015.
- Mathematics and Physics of Mirror Symmetry, Summer School: Mathematical Physics 2016, Tokyo, Japan, August 26-28, 2016.
- Turbulence and Percolation, Summer School: Mathematical Physics 2017, Tokyo, Japan, August 25-27, 2017.

- Topological Quantum Field Theory, Summer School: Mathematical Physics 2018, Tokyo, Japan, August 17-19, 2018.

- Operator algebras and Mathematical Physics, RIMS, Kyoto, Japan, January 23-25, 2008.
- Recent Developments in Operator Algebras, the University of Tokyo, Japan, June 25-26, 2010.

- A member of the scientific committee, Workshop "Modular Invariants, Operator Algebras and Quotient Singularities", Warwick, England, September 1999.
- A member of the scientific committee, 12th Workshop: Non-commutative Harmonic Analysis with Applications to Probability, Będlewo, Poland, August 2009.
- A member of the scientific committee, 13th Workshop: Non-commutative Harmonic Analysis with Applications to Probability, Będlewo, Poland, July 2010.
- A member of the the programme organising committee, A satellite conference on Operator Algebras to ICM-2010, Chennai, India, August 2010.
- A member of the scientific committee, 14th Workshop: Non-commutative Harmonic Analysis with Applications to Probability, Będlewo, Poland, September 2011.
- A member of the scientific committee, 3rd Conference of Settat on Operator Algebras and Applications, Settat, Morocco, November 2011.
- A member of the scientific committee, ICM Satellite Conference on Operator Algebras and Applications, Cheongpung, Korea, August 2014.
- A member of the scientific committee, 17th Workshop: Non-commutative Harmonic Analysis with Applications to Probability, Będlewo, Poland, July 2016.
- A member of the scientific advisory committee, Operator Algebras: Subfactors and their Applications, Isaac Newton Institute for Mathematical Sciences, England, January-June 2017.