| Abbreviation | Definition |
|---|---|
| MNT | Merchant Navy Theatre |
| MPBT | Monterey Peninsula Ballet Theatre |
| MPLT | Max Perutz Lecture Theatre |
| MPTC | Melting Pot Theatre Company |
| MPTG | Mixed Phoenix Theatre Group |
| MRT | Merrimack Repertory Theatre |
| MSYT | Main Street Youth Theatre |
| MTAP | Musical Theatre Artists of Pittsburgh |
| MTC | Marin Theatre Company |
| MTC | Miami Theater Center |
| MTLU | Musical Theatre Lovers United |
| MTO | Mediterranean Theater of Operation |
| MTOT | Music Theatre on the Thames |
| MTOW | Music Theatre of Wenatchee |
| MTR | Musical Theatre Repertory |
| MTW | Music Theatre Wichita |
| MTW | Musical Theatre West |
| MTW | Musical Theatre Works |
| MTYP | Manitoba Theatre for Young People |
| MUT | Made Up Theatre |