| ORT | Northway, Alaska USA 
| Others |
| ORT | Oak Ridge Tennessee
| Others |
| ORT | Oak Ridge, Tennessee
| Others |
| ORT | Oak Ridges Trail
| Others |
| ORT | Object Relations Technique
| Others |
| ORT | Obshchestvennoe Rossiiskoe Televidenie
| Others |
| ORT | Odor Recognition Test
| Others |
| ORT | Off Road Tire
| Others |
| ORT | Off Road Trailer
| Others |
| ORT | Off Road Truck
| Others |
| ORT | Office of Research and Technology Applications, NOAA
| Others |
| ORT | Old Raggedy Threads
| Others |
| ORT | Old Ratty Thread
| Others |
| ORT | Old Ratty Threads
| Others |
| ORT | Olympiaki Radiofonia Tileorasi
| Others |
| ORT | Ongoing Reliability Test
| Others |
| ORT | Ongoing Reliability Testing
| Others |
| ORT | Open Road Tolling
| Others |
| ORT | Operating Room Technician
| Others |
| ORT | Operational Readiness Test
| Others |
| ORT | Operational Readiness Testing
| Others |
| ORT | Opiate Rehabilitation Treatment
| Others |
| ORT | Opioid Risk Tool
| Others |
| ORT | Opposition Round Table
| Others |
| ORT | Optical Relay Tube
| Others |
| ORT | Oral Rehydration Therapy
| Others |
| ORT | Orbit Readiness Test
| Others |
| ORT | Oregon Rafting Team
| Others |
| ORT | Organically Reproduced Trash
| Others |
| ORT | Organisation for Rehabilitation Through
| Others |
| ORT | Organization for Rehabilitation and Training
| Others |
| ORT | Organization for Rehabilitation Through
| Others |
| ORT | Organization for Rehabilitation through Training
| Others |
| ORT | Organization of Rehabilitation through
| Others |
| ORT | Ornithobacterium RhinoTracheale
| Others |
| ORT | Ortaklik
| Others |
| ORT | Oss Review Toolkit
| Others |
| ORT | Out of Range Type
| Others |
| ORT | Outer Retinal Tubulation
| Others |
| ORT | Overland Radar Technology
| Others |
| ORT | Overseas Rabbi Training
| Others |
| ORT | Owned Reference To
| Others |
| ORT | Owners Requirement Table
| Others |
| ORT | Oxford Reading Tree
| Others |
| ORT | Ozark Regional Transit
| Others |