Organists' Associations
- American Guild of Organists (AGO) (USA)
- Associazione Italiana Organisti di Chiesa
- European Guild of Organists (EGO/GEO)
- Incorporated Association of Organists (UK)
- Incorporated Society of Musicians (UK)
- Royal Canadian College of Organists (RCCO)
- Royal College of Organists (RCO) (UK)
- Royal Dutch Association of Organists (KNOV)
- The United Church of Canada Association of Musicians (UCCAM)
Organ Academies
- McGill Summer Organ Academy (Montréal QC, Canada)
- Accademica Organistica Campana (Italy)
- Orgel Konservatorium Wien (Austria)
Organ Builders' Associations
- American Institute of Organbuilders
- Associated Pipe Organ Builders of America
- Institute of British Organbuilding
- International Society of Organbuilders
- Organ Clearing House (USA)
- The Swedish Society for Organ-building
Societies of Friends of the Organ
- Die Gesellschaft der Orgelfreunde (GdO) (Mettlach, Germany)
- International Organ Foundation (Madrid, Spain)
- The Organ Club (UK)
- Organ Society of Sydney(Australia)
Organ History Associations
- Association A. Cavaillé-Coll (Paris, France)
- British Institute of Organ Studies
- Fair Organ Preservation Society (UK)
- La Federation Francophone des Amis de l'Orgue (FFAO) (France)
- Organ Historical Society (USA)
- Organ Historical Trust of Australia
Music Vendors
- Da Capo Used Music
- Éditions Cheldar (Denis Bédard)
- Fairbank Music Publishing
Public Domain Scores
- Choral Public Domain Library
- International Music Score Library Project
- Mutopia Project typeset with LilyPond
- Untraveled Road Music Collection, Kelvin Smith
- Werner Icking Music Archive, University of Aarhus
Notation Software
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