American Crystallographic Association (ACA)
- Includes a newsletter, information on annual conferences, information on careers and positions available, and related links.
- http://aca.hwi.buffalo.edu//

The Crystallographic Society of Japan (CrSJ)
- Details about the society, including news and annual meetings.
- http://www.crsj.jp/

IUCr Commission on Inorganic and Mineral Structures
- Reaserch themes, members, info about meetings.
- http://www.lcm3b.uhp-nancy.fr/cims/

American Association for Crystal Growth (AACG)
- Includes information on conferences, membership information, and a list of positions vacant in this field.
- http://www.crystalgrowth.org/index.php

The Pittsburgh Diffraction Society
- News and information on conferences.
- http://www.pittdifsoc.org

IUCr Commission on Mathematical and Theoretical Crystallography
- Reaserch themes, members, info about meetings.
- http://www.lcm3b.uhp-nancy.fr/mathcryst/

Special Interest Group on Mineralogical Crystallography
- Special Interest Group No. 5 of the European Crystallographic Association.
- http://www.lcm3b.uhp-nancy.fr/ecasig5/

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.
- http://www.ecanews.org/

Swiss Society for Crystallography
- Membership and meetings information. Site in English, French and German.
- http://www.sgk-sscr.ch/

British Crystallographic Association (BCA)
- Includes information about the activities of its groups, conference information, index and introduction to its newsletter, and related links.
- http://img.cryst.bbk.ac.uk/BCA/

Special Interest Group on Aperiodic Crystals
- Modulated structures and quasicrystals
- http://www-xray.fzu.cz/sgip/aphome.html

Czech and Slovak Crystallographic Association (CSCA)
- Association bulletin, information on seminars and conferences, and crystallography resources.
- http://www.xray.cz/xray/cryst.htm

Society of Crystallographers in Australia and New Zealand (SCANZ)
- Includes lists of officials, conference information, membership information, newsletters, and links to educational resources.
- http://www.sca.asn.au/

International Union of Crystallography (IUCr)
- Serves the world community of crystallographers.
- http://www.iucr.org/