Welcome to the
International Union of Crystallography

The IUCr is an International Scientific Union. Its objectives are to promote international cooperation in crystallography and to contribute to all aspects of crystallography, to promote international publication of crystallographic research, to facilitate standardization of methods, units, nomenclatures and symbols, and to form a focus for the relations of crystallography to other sciences. Read more »


  • Winners of the 2023 IUCr Crystal Growing Competition

    We are delighted to announce the winners of the 2023 IUCr Crystal Growing Competition. Schoolchildren from Argentina, Spain and Vietnam impressed the judges with videos that conveyed their crystal growing experiences. Read the full story here.

  • Distinguished Lectures on Quantum Crystallography and Complementary Fields

    Martin Rahm (Chalmers University of Technology, Gothenburg, Sweden) and Peter Baum (Universität Konstanz, Germany) will present the next two lectures in this online series on Thursday 18 April 2024 at 16:00 CET. Please see here for more information.

  • International Decade of Sciences for Sustainable Development, 2024–2033

    An important outcome of the International Year of Basic Sciences for Sustainable Development (2022/2023) was the proclamation of the International Decade of Sciences for Sustainable Development (IDSSD; 2024–2033). The IUCr was pleased to support the Year and is now proud to support the Decade, with the IUCr President, Professor Santiago García-Granda, due to attend a meeting of the Steering Committee on 9 February 2024. IDSSD will be formally launched in Colombia in October 2024, and aims to foster a more transdisciplinary approach to problem-solving and a scientifically literate global population. Read more.

The best in crystallographic research

Uniquely among International Scientific Unions, the IUCr publishes its own primary research journals. Acta Crystallographica Sections A–F, IUCrJ, Journal of Applied CrystallographyJournal of Synchrotron Radiation and IUCrData communicate the highest quality peer-reviewed research findings across the many scientific areas to which crystallography is relevant.

Meetings and webinars

[IUCr2026 logo]

27th IUCr Congress

Calgary, Canada; 11-18 August 2026

Regional Associate meetings
Denver, CO, USA
7-12 July 2024

[AsCA logo]
Selangor, Malaysia
1-6 Dec 2024

[ECA logo]
Padova, Italy
26-30 August 2024

Montevideo, Uruguay
23-26 September 2024

IUCr Corporate Associates

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