| Abbreviation | Definition |
|---|---|
| AANT | American Associates of the National Theatre |
| AATC | Asian American Theater Company |
| AATI | Australian Aboriginal Theatre Initiative |
| ABET | Atlantic Beach Experimental Theatre |
| ABT | American Ballet Theatre's |
| ABT | Arizona Broadway Theatre |
| ACAT | Aqua City Actors Theatre |
| ACT | A Contemporary Theatre |
| ACT | American Conservatory Theater A C T |
| ACTT | Active and Creative Teen Theatre |
| ADITI | Art Dance Imaging Theatre Interaction |
| ADTR | Aboriginal Dance Theatre Redfern |
| AETF | All-England Theatre Festival |
| AITG | Applied and Interactive Theatre Guide |
| AJT | Alliance for Jewish Theatre |
| ALTA | Alliance of Latinx Theater Artists |
| ALTI | Art Live Theatre International |
| ANTT | Aboriginal National Theatre Trust |
| APTC | Actors Professional Theatre Conservatory |
| APTG | Amersham Playgoers Theatre Group |