| Abbreviation | Definition |
|---|---|
| ORSAR | Ontario Road Safety Annual Report |
| ORTE | Overall Rural Tourism Experience |
| ORTG | Online Regional Travel Group |
| ORTM | Outdoor Recreation and Tourism Management |
| ORTO | Outback Regional Tourism Organisation |
| OST | Operation Safer Travel |
| OSTC | One Stop Travel Company |
| OT | Out of Town |
| OTA | Ohio Travel Association |
| OTA | Online Travel Agencies |
| OTA | Online Travel Agency |
| OTA | Online Travel agent○ |
| OTA | Organization of Travel Agents |
| OTBA | Olmsted Travel Baseball Association |
| OTDC | Odisha Tourism Development Corporation |
| OTDC | Oman Tourism Development Company |
| OTDC | Orissa Tourism Development Authority |
| OTDS | Open Travel Data Standard |
| OTEC | Ontario Tourism Education Corporation |
| OTGC | On the go changer? |