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Welcome to the International Union of Crystallography

Advancing structural science globally.

Publications

Open-access, peer-reviewed, society-led primary research journals, reference works and monographs.

What we do

Growing crystallography around the world through education & capacity-building.

Congress

The most important international conference for structural scientists. 

World Directory

World Directory of Crystallographers and of Other Scientists Employing Crystallographic Methods.

Porcupine plots showing relative motions of the four regions in the deglycosylated models of (a) native, (b) oleic acid-bound and (c) linoleic acid-bound Lili-Mip. Regions I, II, III and IV are coloured blue, red, green and orange, respectively.

Protein crystallization recognised with 2026 Ig Nobel Prize

An unusual natural crystal system challenges expectations in structural biology

Leonard Chavas, Nathan Coussens and Ramaswamy Subramanian were among the researchers awarded the 2026 Ig Nobel Prize for a study of naturally formed protein crystals in the viviparous cockroach Diploptera punctata. The work shows how these compositionally complex, nutrient-rich crystals can diffract to atomic resolution, offering an unusual example of how structural science can reveal both molecular architecture and biological function.

Newsletter 2026 · Volume 34 · Number 4Archive · Editorial Board

Meeting Report (IUCr supported)

The Sagamore XX-2024 Conference on Quantum Crystallography, held from 10th to 15th November 2024, at the Shiv Nadar Institution of Eminence (deemed to be a University), Delhi-NCR, marked a significant milestone as the 20th iteration of this prestigious international event was convened for the first time in India. Since its inception in 1964, this meeting has brought together leading researchers in the field of quantum crystallography and related disciplines.

Crystals

What We Stand to Lose: Science, Truth and the Role of Community

I open this Editorial with a personal view. We are clearly living in strange and difficult times. Apart from the obvious concerns about conflicts throughout the world, which I need not elaborate on here, as a scientist and confirmed internationalist, I worry about the growth of anti-science movements in recent years.

Thanks to our partners

Announcements

portraits of the laureates
Announcement

Cockroach milk crystals reveal an unusual solution to protein crystallization

2026 Ig Nobel Prize-winning researchers Ramaswamy Subramanian, Leonard Chavas and Nathan Coussens were among the authors of a remarkable study that revealed how naturally formed protein crystals in the viviparous cockroach Diploptera punctata challenge conventional ideas about protein crystallization.

3 Sep 2026
Announcement

Stay up to date with IUCr 2029

Loved the 27th IUCr Congress and General Assembly? Planning to attend the 29th IUCr Congress in Berlin in 2029? Subscribe to the IUCr2029 newsletter for the latest Congress updates.

Subscribers will receive information about the scientific programme, programme opportunities, special offers and important deadlines, including reminders about abstract submission dates.

28 Aug 2026
Announcement

APERIODIC 2027: XII International Conference on Aperiodic Crystals

27 June–2 July 2027 | AGH University of Kraków, Poland

The XII International Conference on Aperiodic Crystals (APERIODIC 2027) will bring together researchers working on aperiodic crystals, including incommensurately modulated phases, composite crystals and quasicrystals.

28 Aug 2026
Announcement

Submit your research to the 2026 IUCr Congress Collection

Researchers presenting at the 27th IUCr Congress in Calgary, Canada, are invited to submit their work to a dedicated IUCr Journals online collection showcasing research presented at IUCr2026.

Researchers who presented a talk or poster at IUCr2026 are eligible to contribute to the collection.

28 Aug 2026

Meetings & Webinars

Cambridge, MA, United States

2026 New England CryoEM Symposium

Argonne National Laboratory, United States

14th International Conference on Inelastic X-ray Scattering

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Menlo Park, California, USA, United States

Pittsburgh Diffraction Conference at SLAC

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IUCr Congress and General Assembly
Berlin, Germany
18-25 August 2029
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Regional Associate Meetings
ECM-36
Prague
23–28 August 2027
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76th Annual Meeting of the ACA: The Structural Science Society
San Jose, CA
3–7 Aug 2027
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AsCA 2027
Bangkok
6–11 Dec 2027
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LACA VII
San Martín, Buenos Aires Province
6–8 Oct 2027
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