25th Congress and General Assembly of the International Union of Crystallography (IUCr)

14 – 22 August 2021

The International Union of Crystallography (IUCr) is a scientific union with the objectives to promote international cooperation in crystallography and to contribute to all aspects of crystallography, to promote international publications of crystallographic research, to facilitate standardization of methods, units, nomenclatures and symbols, and to form a focus on the relations of crystallography to other types of sciences.

The IUCr fulfils these objectives by publishing in print and electronically primary scientific journals through Crystallography Journals Online, the series of reference volumes International Tables for Crystallography, distributing the quarterly IUCr Newsletter, maintaining the online World Directory/Database of Crystallographers, awarding the Ewald Prize and organising the triennial Congress and General Assembly.

The triennial congresses of the IUCr are the major international scientific meetings for crystallographers world wide. Each congress includes one or more sessions of the General Assembly which approves the policies of the Union. The next Congress will be the 25th and will be held from 14 – 22 August 2021.


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