| Company | Company Type | Programme/Repertoire | Season | Location |
| Armonico Touring Opera | Touring | Baroque - Modern | All Year | National |
| Association of British Orchestras | Membership Organisation | Various events | All year round | national |
| Bampton Classical Opera | Regional opera Company | Classical | July-Sept | Oxfordshire |
| Birmingham Opera Company | Opera Company | Varied | | National |
| British Youth Opera | Training opera company | Standard | Sept | National |
| Carl Rosa Opera | Touring | Light opera | Autumn, Spring | National, USA |
| Children's Music Workshop | | | | |
| Classical Opera Company | Touring Opera | Classical | All | National |
| Clod Ensemble | Touring music theatre company | Contemporary | varied | national and international |
| ENO Baylis | Opera educational | Educational projects + contemporary arts | All | London |
| English Pocket Opera | Touring opera company | Standard | All | National, international |
| English Touring Opera | Touring opera | Standard | Feb-Jun; Oct-Dec | National |
| Garden Opera | Touring | Standard | All year | National |
| Garsington Opera | Venue based opera company | Standard and rarities | June/July | Oxford/London |
| Glyndebourne Education | Touring opera education company | Educational | All | National |
| Grange Park Opera | Opera company | Standard and Rarities | June/July | South East |
| Hand Made Opera | Touring opera company | Classics and modern classics | All | National, international |
| Hatstand Opera | touring opera | highlights from opera/operetta/song | All | National, international |
| Iford Arts | Opera Festival | Various | June-August | Wiltshire based |
| Independent Opera at Sadler's Wells | Opera company | Standard and contemporary | May,Nov | London |
| Music Theatre Wales | Touring opera company | New and contemporary | All | UK & international |
| National Opera Studio | Opera Training | | May showcase, ad hoc events | London |
| New Chamber Opera | Opera company | Baroque/contemporary | All | Oxford based |
| Nitro | Touring | New music theatre and opera | Varies | National |
| Northampton Festival Opera | Opera Company | Standard | Feb/Mar, Oct/Nov | East Midlands |
| Opera Anywhere | Touring opera company | Various | All | Regional/National |
| opera by definition | Touring opera company | Standard and music theatre | All | National, international |
| Opera Circus | Touring opera/music theatre | Devised and newly commissioned | All | National, International |
| Opera della Luna | Touring opera company | Opera and Operetta | All | National |
| The Opera Group | Touring | Contemporary | All | National |
| Opera North Education and Projects | Opera educational | Education and projects | All | The North of England |
| Opera Restor'd | Touring | 17th century, 18th century | All | National |
| Operaluna | Opera promoter | | Summer | Marlborough |
| Opera UK | Touring opera company | Standard | October | National |
| Pegasus Opera | Touring | Standard repertoire | Spring | national |
| Pimlico Opera | Touring company | Standard and musicals | Autumn | South East |
| Royal Opera House Education | Opera Educational | Educational projects | All | London |
| Selfmade Music Theatre | Music theatre, touring | Contemporary | all | national, international |
| Streetwise Opera | Opera Company | Contemporary | All | National |
| Tête à Tête | Touring opera | Contemporary | all | National |
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