The United States of America National Committee for Crystallography (USNC/Cr) represents U.S. crystallographers in the International Union of Crystallography (IUCr) through the National Academy of Sciences. The IUCr strives to promote international cooperation and publication in crystallography; to facilitate standardization of methods, units, nomenclatures and symbols; and to form a focus for the relations of crystallography to other sciences.

The photo above depicts a fragment of the world largest molecular structure model (NaCl).

27th Congress and General Assembly
of the IUCr in Calgary, Canada

The 2026 IUCr Congress in Calgary Canada will be jointly hosted by the U.S. National Committee for Crystallography, the Canadian National Committee for Crystallography, and the American Crystallographic Association. It will held at new BMO Convention Center at Stampede Park, home to one of the world’s largest rodeo festivals, which draws over a million visitors each year.”