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- Organizations for Enthusiasts and Collectors
- Australia, Australian Antiquarian Horological Society
- Austria, Gnomonicae Societas Austriaca [Working Group for Sundials]
- Canada, La Commission des Cadrans solaires du Québec [Sundial Association of Quebec] [Translate into English]
- Denmark, Dansk Horologisk Selskab
- France, Association Nationale des Collectionneurs et Amateurs d'Horlogerie Ancienne et d'Art (ANCAHA) [Translate into English]
- France, French Horological Association (AFAHA)
- Germany, Deutsche Gesellschaft für Chronometrie [German Association of Chronometry] [Translate into English]
- Germany, Kölner Uhrenkreis, Cologne region group of DGC
- Hong Kong, The Art of Time Club
- Italy, Associazione Italiana Cultori di Orologeria Antica (HORA)
- Italy, Gnomonica Italiana [Italian Sundial Association] [Translate into English]
- Italy, Il Club Orologi Meccanici
- Netherlands, De Klokkenmaker
- Netherlands, Dutch Sundial Society
- Netherlands, Stichting tot Behoud van het Torenuurwerk [The Foundation for the Preservation of Tower Clocks] [Translate into English]
- Poland, Klub Milosników Zegarów i Zegarków [Watch & Clock Enthusiasts Club]
- Spain, Societat Catalana de Gnomònica [Catalonian Sundial Association]
- Sweden, Sveriges Klocksamlares Ricksfoerning [Swedish Association of Watch and Clock Collectors]
- Switzerland, Chronometrophilia,the Swiss association of collectors and amateurs of ancient and classic horology
- UK, The Antiquarian Horological Society
- UK, British Horological Institute
- UK, British Sundial Society
- UK, The Dorset Clock Society
- UK, Epping Forest Horology Club
- UK, St. Albans Clock Club
- UK, Wales & Marches Horological Society
- USA, The American Watch Company
- USA, American Watchmakers & Clockmakers Institute
- USA, Greater Boston Watch & Clock Collectors
- USA, International Watch Fob Association
- USA, National Association of Watch & Clock Collectors
- USA, North American Sundial Society
- USA, Save America's Clocks
