| American Association for Crystal Growth: Includes information on conferences, membership information, and a list of positions vacant in this field. | |
| American Crystallographic Association: Includes a newsletter, information on annual conferences, information on careers and positions available, and related links. | |
| British Crystallographic Association: Includes information about the activities of its groups, conference information, index and introduction to its newsletter, and related links. | |
| Czech and Slovak Crystallographic Association: Association bulletin and crystallography resources. | |
| 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 | |
| International Union of Crystallography (IUCr): Serves the world community of crystallographers. | |
| IUCr Commission on Mathematical and Theoretical Crystallography: Reaserch themes, members, info about meetings. | |
| Society of Crystallographers in Australia: Includes lists of officials, conference information, membership information, newsletters, and links to educational resources. | |
| Special Interest Group on Aperiodic Crystals: Modulated structures and quasicrystals | |
| Special Interest Group on Mineralogical Crystallography: Special Interest Group No. 5 of the European Crystallographic Association. | |
| Swiss Society for Crystallography: Membership and meetings information. Site in English, French and German. | |
| The Egyptian Society of Crystallography and Applications: ESCA follows scientific progress in crystallography and related activities. | |
| The Pittsburgh Diffraction Society: News and information on conferences. |
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