New England Opera Club
- Information about opera events, performances, repertories and recitals in the New England region.
- http://neoperaclub.org/

Opera USA
- A non-profit corporation whose mission is to promote, instruct, create and develop opera and musical theater for Americans. Includes performance dates, production schedules, singers listings, festivals and membership information.
- http://www.operausa.org/

Wagner Society of England
- Includes membership information, history, events, links to other societies worldwide, how to buy tickets to events, and an inventory of library recordings, books and CDs.
- http://www.wagnersociety.org/

Trubadur
- A club for Polish opera fans, with articles, reviews and interviews from Trubadur magazine), libretti of Polish operas, recordings and discussion forum. [Polish/English]
- http://www.trubadur.pl/

Metropolitan Opera Guild
- Supports the Metropolitan Opera in New York and encourages the appreciation of opera generally. Includes educational material, news about the Met and merchandise.
- http://www.metoperafamily.org/guild/

California Opera Association
- Non-profit organization dedicated to artistic education and enrichment in opera.
- http://www.calopera.org/

OPERA America: The Service Organization for Opera
- National service organization based in New York supports opera and the musical arts internationally with education and awareness programs.
- http://www.operaamerica.org/

Richard Tucker Music Foundation
- Non-profit organization honoring the memory of the tenor at Lincoln Center's Avery Fisher Hall, granting awards to singers at three levels of development, and producing educational events nationwide.
- http://www.richardtucker.org/

Bel Canto Society
- Non-profit organization that publishes recordings and sponsors opera performances. Includes store, event listings, and CD reviews.
- http://www.belcantosociety.org/

New York Opera Forum
- Gives classically trained singers the opportunity to learn and perform standard operatic repertoire in the original languages.
- http://www.nyoperaforum.com/

Opera Volunteers International
- A nonprofit organization of volunteers and associations which promotes opera through volunteer activities in the United States, Canada, and other countries.
- http://www.operavol.org

Magdala Opera Trust
- A community-based musical organisation offering operatic training and concert work, based in Nottingham, England. Site includes audio clips, events schedule and CD.
- http://www.magdalaopera.com/