| Abbreviation | Definition |
|---|---|
| OSW | One-Stop Wholesaler |
| OSW | Outer Space Wetworks |
| OSWSC | Ontario Spring Water Sake Company |
| OSY | Osbourne Family Stores |
| OTA | Online Travel Agency |
| OTA | Online Travel Agent |
| OTA | Open Travel Alliance |
| OTA | Organic Trade Association |
| OTAI | Over The Air Institute |
| OTBL | ONGC TERI Biotech Ltd |
| OTBT | Outside-The-Box-Thinking |
| OTC | Online Travel Company |
| OTC | OnTrack Consulting |
| OTC | Open Text Corp |
| OTC | Operation and Transport Corporation |
| OTC | Owatonna Tool Company |
| OTCM | OTC Markets Group, Inc. |
| OTDC | Odisha Tourism Development Corporation |
| OTDC | Oman Tourism Development Company |
| OTDC | Orissa Turism Devlopment Corporation |