- 1000 Miles Off Broadway
- Act II Community Theatre
- ACT Inc.
- The Acting Depot (resources for actors)
- Alpha Players
- The Arrow Rock Lyceum Theatre
- The Alton Little Theater
- The ArtLoft Theatre
- Arts For Life
- The Avalon Theatre Company
- The Circus Day Foundation
- Circus Flora
- Clayton Community Theatre
- Curtain’s Up Theatre Company
- Destination Theatre Company
- The DisAbility Project
- The Edison Theatre at Washington University
- Encore at the Miners
- Everydaycircus Inc.
- Family Musical Theatre
- First Run Theatre
- The Fox Theatre
- The Hawthorne Players
- HotCity Theatre Company
- Hydeware Theatre
- The Kevin Kline Awards (professional theatre awards program)
- Kirkwood Theatre Guild
- K’s Theatrical Korps
- The Looking Glass Playhouse
- Metro Theatre Company
- The Midnight Company / After Midnight
- The Midwest Lyric Opera Company
- The Monroe Actors Stage Company
- Muddy Waters Theatre Company
- The Muny
- Mustard Seed Theatre
- New Jewish Theatre
- New Line Theatre
- Off Center Theatre Company / Slighly Askew Theatre Ensemble
- Opera Theatre of St. Louis
- Ozark Actors Theatre
- Paper SLIP Theatre
- Piwacket Theatre for Children
- The Playhouse at Westport Plaza
- Ragged Blade Productions
- The Repertory Theatre of St. Louis
- The Roberts Orpheum Theatre
- The Royal Dumpe Dinner Theater
- St. Louis Actors’ Studio
- St. Louis Auditions
- The St. Louis Black Repertory Company
- St. Louis Community
College at Florissant Valley Theater Department - St. Louis Community College at Forest Park Theatre Department
- St. Louis Improv
- St. Louis Shakespeare
- The St. Louis University Theatre Department
- St. Peter’s Act II Community Theatre
- The Shakespeare Festival of St. Louis
- Shooting Star Productions
- Sound Stage Productions (readers theatre)
- Southern Illinois University at Edwardsville Theater Department
- Stage Left (podcast of news, CD reviews and interviews from world of stage, screen and cabaret)
- Stages St. Louis
- Stray Dog Theatre
- Take Two Productions
- That Uppity Theatre Company
- Theatre Guild of Webster Groves
- TheatrGROUP
- The Tin Ceiling
- Union Avenue Opera
- The Department of Theatre, Dance, and Media Arts at the University of Missouri at St. Louis
- Upstage Productions
- Upstream Theatre
- The Washington Avenue Players Project
- Washington University Performing Arts Department
- The Conservatory of Theatre Arts at Webster University
- West End Players Guild