American Opera Theater
- Company dedicated to creative stagings of early opera. Includes news, schedule and summer program information.
- http://www.americanoperatheater.org/

Opera at Peabody
- Performances, education and other information on opera from the Opera Department of the Peabody Conservatory.
- http://www.peabodyopera.org/

Opera Vivente
- Chamber opera company presents two productions each season at Emmanuel Episcopal Church, in the Mt. Vernon area. Includes company history, director's message, upcoming productions and directions.
- http://www.operavivente.org/

Young Victorian Theatre Company
- Baltimore's home for Gilbert and Sullivan. Information on tickets, current production, history, as well as Gilbert and Sullivan links.
- http://www.yvtc.org/

Baltimore Opera
- Stages four operas each season at the Lyric Opera House. Includes current production and cast information, news, links, "starving students" ticket program, education and special programs, and employment and contact information. Online ticketing.
- http://www.baltimoreopera.com/