| OMN | Occult and Mysticism Network
| Others |
| OMN | Ohio Ministry Network
| Others |
| OMN | Oklahoma Museum Network
| Others |
| OMN | Ollie McKendrick Ness
| Others |
| OMN | On My Nerves
| Others |
| OMN | On-line Marketing Network
| Others |
| OMN | One More Night
| Others |
| OMN | One Of Many Names
| Others |
| OMN | Operations and Maintenance, Navy
| Others |
| OMN | Operations Maintenance Navy
| Others |
| OMN | Optical MEMS and Nanophotonics
| Others |
| OMN | Oracle Media Network
| Others |
| OMN | Orb Media Network
| Others |
| OMN | Organo Mineral Nodules
| Others |
| OMN | Oromia Media Network
| Others |
| OMN | Osmanabad, India
| Others |
| OMN | Other Minority Nationality
| Others |
| OMN | Ottawa Manufacturers' Network
| Others |
| OMN | Outdoor Map Navigator
| Others |
| OMN | Overtone Music Network
| Others |