| Abbreviation | Definition |
|---|---|
| OTA | Office of Technology Assessment |
| OTA | Officer Traning Academy (of India) |
| OTA | One True Army |
| OTAI | Over-The-Air Initialization |
| OTAN | Organisation du Traité de l'Atlantique Nord |
| OTAN | Organização do Tratado do Atlântico Norte |
| OTAN | Organización del Tratado de Atlántico Norte |
| OTAR | Over-The-Air Re-keying |
| OTB | Only The Best |
| OTB | On-Time Bonus |
| OTC | Officer in Tactical Command |
| OTC | Officer Training Corps |
| OTC | Operational Test Command |
| OTCIXS | Officer in Tactical Command Information Exchange System |
| OTD | On The Day |
| OTD | Operational Test Director |
| OTE | On The Edge |
| OTEC | Offshore Technical Evaluation Condition |
| OTF | Off The Floor |
| OTF | Old Technology Fighter |