- Annex Children's Theatre in Education (ACTE)
 - Toronto - Offers theatre training for children aged 6-15. Located in Toronto, Ontario. - Bramalea Little Theatre
- Bramalea - Adult group promoting live theatre in the community.
- Brampton Music Theatre
- Brampton - Information on upcoming shows, reviews of current shows, and history of past shows. Includes read-through and audition times, as well as rehearsal and performance times.
- Canadian Theatre Record
- Toronto - Collection of original Canadian theatre materials, including designs, photographs, posters, and an index of productions. From Toronto Public Library.
- Carnival Diablo
- Toronto - Features over 20 amazing death-defying feats including psychokenisis, insect eating, sword swallowing, impaling, and more.
- Council of Drama and Dance in Education (CODE)
- Toronto - Develops, supports, and promotes drama in Ontario schools.
- Curtain Call Players
- Toronto - Information on the community theatre troupe, current and past shows, and upcoming auditions.
- Dora Mavor Moore Awards
- Toronto - Awarded for excellence in Toronto theatre.
- Driftwood Theatre Group
- Oshawa - For classical, outdoor, summer theatre across Southern Central Ontario.
- Feast of Fools Theatre
- Toronto - Offering programming for general audiences, children, and summer season.
- Lorraine Kimsa Theatre for Young People
- Toronto - Show drama classes and shows for kids and youth.
- Music Theatre Etobicoke (MTE)
- Etobicoke (Toronto) - Presents musical plays to community audiences.
- Onstagetoronto.ca
- Toronto - Features listings and news of current and upcoming plays, musicals, and long-running shows in Toronto and Ontario.
- Oshawa Little Theatre
- Oshawa - Nonprofit community theatre offers information on season of plays, tickets, subscriptions, and more.
- P.M. Productions
- Toronto - Creators and producers of musicals.
- Peel Panto Players
- Brampton - Performs British-style pantomime in the Brampton and Bramalea areas. Audition information provided.
- Poculi Ludique Societas
- Toronto - Sponsors production of early plays, from the beginnings of medieval drama to as late as the middle of the 17th century.
- Resurgence Theatre Company
- Newmarket - Founded to resurge the classics and ignite new and contemporary works within York Region and beyond with a strong focus on utilizing the surging energy of emerging professional artists.
- Scarborough Gilbert And Sullivan Society
- Scarborough (Toronto) - Staging operettas by Gilbert and Sullivan since 1966.
- Seventh-Star Productions
- Uxbridge - Lists past and current productions as well as ticket, sponsorship, and auditioning information.
- Shakespeare In Action
- Toronto - Dedicated to bringing new life to the plays of the bard through performances, in-school plays and workshops, and teacher training.
- Soulpepper
- Toronto - Artist-run, classical repertory company dedicated to presenting Canadian interpretations of history's greatest plays.
- Stage Door
- Toronto - Represents all live professional theatre in Toronto and southwestern Ontario, with media releases, playbills, contacts, and reviews.
- Theatre Ontario
- Toronto - Includes information on summer courses, funding for training, special events and projects, resources and publications, awards, and membership.
- Theatre Passe Muraille
- Toronto - Alternative theatre dedicated to the development and production of new Canadian works.
- Theatrefolk
- Toronto - Offers workshops in Shakespeare for students, and scripts for plays, monologues, and performances.
- Threshold Theater
- Toronto - Dedicated to inventive adaptations, exciting environmental works, and fresh approach to scripts.
- Toronto Theatre Alliance
- Toronto - Creating an environment of mutual support and unity in which theatre and dance can flourish in Toronto.
- Upstart Crow Theatre Group
- Toronto - Dedicated to producing challenging, thought-provoking pieces that will be entertaining for both our members and our audiences.
- Urban Spine
- Toronto - Theatre company with an emphasis on movement, including corporeal mime and stage combat, featuring satire, children's plays, and dramas.
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