- A. Karamitsos
 - Specializes in the stamps and postal history of Greece, Greek Errors, New Greek Territories, Levant, and Cyprus. Holds public auctions. - Antique Doorknob Collectors of America
- Protecting, preserving, and studying the wide range of ornamental builders hardware that is a part of America's heritage.
- Art and Antique Dealers League of America
- Nonprofit membership organization devoted to the interests of dealers and collectors. Contains a directory of dealers by specialty.
- Confédération Internationale des Négociants en Oeuvres d'Art (CINOA)
- Representing art and antiques dealers worldwide.
- International Antiquarian Mapsellers Association (IAMA)
- Promotes the professional trade in antiquarian, collectible maps, atlases, charts, and related books.
- National Antique & Art Dealers Association of America
- Nonprofit trade organization of America's leading dealers, mutually pledged to safeguard the interests of those who buy, sell, or collect antiques and works of art.
- National Association of Limited Edition Dealers
- Nonprofit organization of collectible retailers and manufacturers. Find dealers and other items through search engine.
- Society of Dutch Art and Antique Dealers
- Trade organization of art and antique dealers. Also in Dutch.
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