The Triennial WATOC Congresses have occured since 1987 and have become one of the largest international meetings in the field of theoretical and computational chemistry.

The WATOC 2028 congress will be held in Merida, Mexico on January 9-14, 2028, preceded by Young WATOC on 8th January and will be organised by Profs. Gabriel Merino and Annia Galano.

The 2031 congress will be in Brisbane, Australia.

Previous WATOC Congresses

WATOC 2025 was held in Oslo from 22-27 June 2025 and organised by Prof. Trygve Helgaker,

WATOC-2020 , Vancouver, Canada July 3 - 8, 2022 organised by Russ Boyd, Alex Brown, Gino A. DiLabio and Stacey, D. Wetmore, 925 participants. Special journal issue in the Can. J. Chem.

WATOC-2017, Munich, Germany, August 27-September 1, 2017,
organized by Christian Ochsenfeld, 1520 participants.
Program - Pocket Program - Photos

WATOC-2014, Santiago de Chile, October 5-10, 2014,
organized by Alejandro Toro-Labbé, 792 participants.
Program

WATOC-2011, Santiago de Compostela, Spain, July 17-22, 2011,
organized by Manuel Yáñez and Otilia Mó, 1353 participants.
Photo - Program - Poster

WATOC-2008, Sydney, Australia, September 14-19, 2008,
organized by Leo Radom, 830 participants.
Program - Poster - Photos

WATOC-2005, Capetown, South Africa, January 16-21, 2005,
organized by Kevin Naidoo, 407 participants.
Photo - Overview - Program

WATOC-2002, Lugano, Switzerland, August 6-9, 2002,
organized by Hans-Peter Lüthi, 620 participants.

WATOC-1999, London, UK, August 1-6, 1999,
organized by Mike Robb and Henry Rzepa, ca. 650 participants.

WATOC-1996, Jerusalem, Israel, July 7-12, 1996,
organized by Yitzhak Apeloig and Amiram Goldblum, 369 participants.

WATOC-1993, Toyohashi, Japan, July 18-25, 1993,
organized by Keiji Morokuma, 475 participants.

WATOC-1990, Toronto, Canada, July 8-14, 1990,
organized by Imre Csizmadia, 590 participants.

WATOC-1987, Budapest, Hungary, August 12-18, 1987,
organized by Imre Csizmadia, 475 participants.