- Casa Italiana Opera Company
 - Los Angeles - Provides a professional workshop concentrating on Italian operas in Los Angeles, California. - Contemporary Opera of Los Angeles
- Los Angeles - Presenting world's repertory in contemporary settings, sung in English.
- Los Angeles Opera
- Los Angeles - Featuring directions to the Dorothy Chandler Pavilion and the Music Centre, artist bios, ticket and subscription information, and performance synopses.
- Lyric Opera of Los Angeles
- Los Angeles - Brings opera productions to the community using emerging and established singers and actors.
- Opera Pacific
- Costa Mesa - Performs at the Orange County Performing Arts Centre.
- Pasadena Lyric Opera
- Pasadena
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