| Abbreviation | Definition |
|---|---|
| RTO | Receptive Tour Operator |
| RTO | Recovery Time Objectives |
| RTO | Recruit Training Officers |
| RTO | Regenerative Thermal Oxidation |
| RTO | Registered Training Organisation |
| RTO | Registered Training Organisations |
| RTO | Rejected Take Off |
| RTO | Reno Tahoe Odyssey |
| RTO | Reno Tahoe Open |
| RTO | Rent to Own |
| RTO | Reptile Take Over |
| RTO | Restore Time Objective |
| RTO | Retention Training and Observation |
| RTO | Revert To Owner |
| RTO | Road Transport Office |
| RTO | Thermal Oxidizer |
| RTOA | Railroad Transportation and Operation Agreement |
| RTOA | Road Transport Operators Association |
| RTOA | Road Tunnel Operator Association |
| RTOA | Round Table Owners Association |