| American Association for Crystal Growth (AACG): Includes information on conferences, membership information, and a list of positions vacant in this field. |
| American Crystallographic Association (ACA): Includes a newsletter, information on annual conferences, information on careers and positions available, and related links. |
| British Crystallographic Association (BCA): Includes information about the activities of its groups, conference information, index and introduction to its newsletter, and related links. |
| Czech and Slovak Crystallographic Association (CSCA): Association bulletin, information on seminars and conferences, and crystallography resources. |
| European Crystallographic Association (ECA): 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 Inorganic and Mineral Structures: Reaserch themes, members, info about meetings. |
| IUCr Commission on Mathematical and Theoretical Crystallography: Reaserch themes, members, info about meetings. |
| Society of Crystallographers in Australia and New Zealand (SCANZ): 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 Crystallographic Society of Japan (CrSJ): Details about the society, including news and annual meetings. |
| 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. |
Classical
