| ORION | Occupational Rehabilitation Initiate of Nevada 
| Others |
| ORION | Ocean Research Interactive Observatory Network
| Others |
| ORION | On Road Idiotic Operational Nightmare
| Others |
| ORION | On Road Integrated Optimization and Navigation
| Others |
| ORION | On Road Integrated Optimized Navigation
| Others |
| ORION | On Road Integration Optimization and Navigation
| Others |
| ORION | Ontario Research and Innovation Optical Network
| Others |
| ORION | Open Research Infrastructure for Optimizing Networks
| Others |
| ORION | Operational Response and Investigative Online Network
| Others |
| ORION | Organization Resisting Imprisonment of Nations
| Others |
| ORION | Our Race Is Our Nation
| Others |
| ORION | Outdoor Recreational Instruction On Nature
| Others |
| ORION | Overspill Routing in Optical Networks
| Others |