Royal Opera House
- The ROH in Covent Garden, now fully restored. Includes virtual tour, events and booking, press releases, information and directions.
- http://www.royalopera.org

Company of Singers
- Semi-professional singing group specialising in opera in West London. Lists past and future events, and links to opera/choral sites
- http://web.ukonline.co.uk/cosingers/coswho.htm

Mill Hill Amateur Operatic Society
- Includes membership and committee details, information for would-be members, news on the next production and details on past productions, including photos.
- http://www.mhaos.com/

The Carl Rosa Opera Company
- Touring company. Includes company information and history, production details and diary of events.
- http://www.carlrosaopera.co.uk/

Fettuccine Opera Company
- Organising opera and operetta evenings for charitable causes. Company information, details of future events and contact details are provided.
- http://www.fettuccine-opera.co.uk/

AAC
- Multi-ethnic ensemble opera company based in Wembley. Includes details of upcoming and past performances with photos.
- http://www.aacopera.com/

Pegasus Opera Company
- Multiracial professional touring company. Provides background information on the organisation, contact details and prices for Friends of Pegasus.
- http://www.pegopera.org/

English Pocket Opera
- Small-scale opera company. Provides details of future and past productions, outreach and education programmes, news and mailing list.
- http://www.pocketopera.co.uk/

English National Opera
- Britain's only full-time repertory opera company, based near Covent Garden. Includes dairy of what's on and booking information.
- http://www.eno.org/