| Abbreviation | Definition |
|---|---|
| OBAE | Object Based Audio Essence |
| OBT | Off Broadway Theatre |
| OBT | Oregon Ballet Theatre |
| OCT | Oregon Children's Theatre |
| OCT | Oregon Contemporary Theatre |
| OFTB | Office of Film Theatre and Broadcasting |
| OFTB | Office of Film Theatre Broadcasting |
| OKTC | Original Kids Theatre Company |
| OSTA | Oberlin Student Theater Association |
| OT | Operation Theater |
| OTC | Olney Theatre Center |
| OTSL | Opera Theatre of Saint Louis |
| OTT | Out of The Theatre |
| OTTC | Our Time Theatre Company |
| OTYP | Outback Theatre for Young People |
| OVST | Ohio Valley Summer Theater |
| OVT | Orthopaedic Video Theater |
| PATOS | Pittsburgh Area Theatre Organ Society |
| PBDT | Pacific Ballet Dance Theatre |
| PBT | Pittsburgh Ballet Theatre |