Association of Medical Illustrators (AMI)
   International organization composed of medical illustrators, related professionals, and students. Membership information and member directory.
   http://www.medical-illustrators.org/

Guild of Natural Science Illustrators
   Non-profit organization that sets professional standards, provides opportunities for professional and scholarly development, encourages and assists member networking.
   http://www.gnsi.org/

Israel Association of Illustrators
   Non profit organizations for the advancement of the profession of illustration in Israel. Includes members portfolios.
   http://www.illustrators.org.il/

Society of Illustrators San Diego
   Professional organization that promotes the interests of illustrators. Includes activities, resources, membership information, and samples of members' work.
   http://www.societyofillustratorssandiego.org/

The Association of Illustrators (AOI)
   Non-profit trade association dedicated to its members’ professional interests and the promotion of illustration. Provides news, membership information, portfolios and events.
   http://www.theaoi.com/

The Illustrators' Partnership of America (IPA)
   Non-profit organization dedicated to promoting the business of professional illustration and protecting the intellectual property rights of its members.
   http://www.illustratorspartnership.org/