ORTT
| Acronym | Definition |
|---|---|
| ORTT | Országos Rádió És Televízió Testület (Hungarian: National Radio and Television Authority; Budapest, Hungary) |
| ORTT | Operations Room Team Trainer (Royal Canadian Navy) |
| ORTT | Outward Remittance Telegraphic Transfer (HSBC Bank; Hong Kong) |
| ORTT | Off Road Trail Tools (Tucson, AZ) |
| ORTT | Order of Repeatermen and Toll Testboardmen (telephone industry union) |
| ORTT | Operational Readiness Training Test |