| RTO | Radio Telephone Operator 
| Others |
| RTO | Radio Traffic Only
| Others |
| RTO | Random Target Optimizer
| Others |
| RTO | Rapid Take Off
| Others |
| RTO | Reach Truck Operator
| Others |
| RTO | Ready To Order
| Others |
| RTO | Ready Training Online
| Others |
| RTO | Real Time Object
| Others |
| RTO | Real Time Optimized
| Others |
| RTO | Real Time Ordering
| Others |
| RTO | Real Time Output
| Others |
| RTO | Real-Time Oscillograph
| Others |
| RTO | Really Tasty Onion
| Others |
| RTO | Really Terrible Orchestra
| Others |
| RTO | Really Ticked Off
| Others |
| RTO | Receiver Timeout
| Others |
| RTO | Receptive Tour Operator
| Others |
| RTO | Recognised Test Organisations
| Others |
| RTO | Recovery Time Objective
| Others |
| RTO | Refuse To Obey
| Others |
| RTO | Regenerative Thermal Oxidation
| Others |
| RTO | Regenerative Thermal Oxidizer
| Others |
| RTO | Regional Tax Office
| Others |
| RTO | Regional Tourism Organisation
| Others |
| RTO | Regional Transmission Organization
| Others |
| RTO | Regional Transmission Organizations
| Others |
| RTO | Regional Transport Office
| Others |
| RTO | Regional Transport Officer
| Others |
| RTO | Regional Travel Options
| Others |
| RTO | Registered Training Organisation
| Others |
| RTO | Registered Training Organisations
| Others |
| RTO | Registered Training Organization
| Others |
| RTO | Rejected Take Off
| Others |
| RTO | Rejected Take-Off
| Others |
| RTO | Rejected TakeOff
| Others |
| RTO | Renault Trucks Oils
| Others |
| RTO | Reno Tahoe Odyssey
| Others |
| RTO | Reno Tahoe Open
| Others |
| RTO | Rent to Own
| Others |
| RTO | Rent-To-Own
| Others |
| RTO | Reptile Take Over
| Others |
| RTO | Request Timed Out
| Others |
| RTO | Requested Time Off
| Others |
| RTO | Research and Technology Organisation
| Others |
| RTO | Research and Technology Organization
| Others |
| RTO | Responsible Test Organization
| Others |
| RTO | Restore Time Objective
| Others |
| RTO | Retention Training and Observation
| Others |
| RTO | Retentive Timer On
| Others |
| RTO | Retired Teachers of Ontario
| Others |
| RTO | Retransmission Time Out
| Others |
| RTO | Retransmission Timeout
| Others |
| RTO | Return To Office
| Others |
| RTO | Return To One
| Others |
| RTO | Reverse Take Over
| Others |
| RTO | Reverse TakeOver
| Others |
| RTO | Revert To Owner
| Others |
| RTO | Right Toe Off
| Others |
| RTO | Right Turn Only
| Others |
| RTO | Road and Tunnel Operations
| Others |
| RTO | Road Traffic Offenders
| Others |
| RTO | Road Traffic Ordinance
| Others |
| RTO | Road Transport Office
| Others |
| RTO | Road Transport Operator
| Others |
| RTO | Round-trip Time Out
| Others |
| RTO | Royal Trusted One
| Others |
| RTO | Runtime Object
| Others |
| RTO | Thermal Oxidizer
| Others |