International Union of Crystallography (IUCr)
Serves the world community of crystallographers.

American Crystallographic Association
Includes a newsletter, information on annual conferences, information on careers and positions available, and related links.

Society of Crystallographers in Australia
Includes lists of officials, conference information, membership information, newsletters, and links to educational resources.

Czech and Slovak Crystallographic Association
Association bulletin and crystallography resources.

American Association for Crystal Growth
Includes information on conferences, membership information, and a list of positions vacant in this field.

Special Interest Group on Aperiodic Crystals
Modulated structures and quasicrystals

Slovenian Crystallographers Homepage
Description of the Activities of the Slovenian Crystallographers

The Egyptian Society Of Crystallography and Applications
aims to follow scientific progress in the Crystallography and related activities.

British Crystallographic Association
Includes information about the activities of its groups, conference information, index and introduction to its newsletter, and related links.

Swiss Society for Crystallography
Membership and meetings information. Site in English, French and German.

European Crystallographic Association
Includes minutes and reports of its executive council and groups, conference information, related news and lists of officials and rules, as well as membership information

Special Interest Group on Mineralogical Crystallography
Special Interest Group No. 5 of the European Crystallographic Association.

International Workgroup on Mathematical and Theoretical Crystallography
Reaserch themes, members, info about meetings.

The Pittsburgh Diffraction Society
News and information on conferences.