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- Mabou Mines (New York)
- Mad River Theater Works (West Liberty, Ohio)
- Madison Repertory Theatre (Madison, Wisconsin)
- Magic Theatre, Inc (San Francisco, California)
- Main Street Theater (Houston, Texas)
- Manhattan Ensemble Theater (New York)
- Manhattan Theatre Club (New York)
- Marin Shakespeare Company (San Rafael, California)
- Marin Theatre Company (Mill Valley, California)
- Maryland Ensemble Theatre (Frederick, Maryland)
- Ma-Yi Theater Company (New York)
- McCarter Theatre Center (Princeton, New Jersey)
- Meadow Brook Theatre (Rochester, Michigan)
- Melting Pot Theatre Company (New York)
- Merrimack Repertory (Lowell, Massachusetts)
- Merry Go-Round Playhouse (Auburn, New York)
- Metro Theater Company (St Louis, Missouri)
- Milwaukee Chamber Theatre (Milwaukee, Wisconsin)
- Milwaukee Repertory Theater (Milwaukee, Wisconsin)
- Milwaukee Shakespeare Company (Milwaukee, Wisconsin)
- Mint Theater Company (New York)
- Miracle Theatre Group (Portland, Oregon)
- Mirror Repertory Company (New York)
- Mixed Blood Theatre Company (Minneapolis, Minnesota)
- Montana Repertory Theatre (Missoula, Montana)
- Montgomery Theater (Souderton, Pennsylvania)
- Moving Arts (Los Angeles, California)
- Mum Puppettheatre (Philadelphia, Pennsylvania)
- Mu Performing Arts (Minneapolis, Minnesota)
- My Fair Heathen Productions (Brooklyn, New York)
- Native Voices at the Autry (Los Angeles, California)
- Nautilus Music-Theater (St Paul, Minnesota)
- Nebraska Repertory Theatre (Lincoln, Nebraska)
- Nevada Shakespeare Company (Reno, Nevada)
- New American Theater (Rockford, Illinois)
Read more about this topic: List Of Theatre Communications Group Member Theatres