| Orbit Multiresolution Image | Academic & Science |
| Office of Medical Investigator, UNM School of Medicine | Academic & Science |
| Optical Mechanics Inc | Business |
| Open Management Instrumentation | Business |
| Optimising Marketing Investment | Business |
| Obligatory Medical Insurance | Business |
| Office Management and Infrastructure | Business |
| Owens & Minor, Incorporated | Business |
| Operations Management International | Business |
| OptiMetrics, Incorporated | Business |
| Orthopaedic Medicine International | Business |
| Office Mate International, Ltd. | Business |
| Orosur Mining | Business |
| Occupational & Medical Innovatns Ltd | Business |
| Open Management Infrastructure | Business |
| Online Marketing Institute | Business |
| Owens Minor Inc | Business |
| Open Music Initiative | Community |
| Oblates of Mary Immaculate | Community |
| Open Messaging Interface | Computing |
| Optical Mode Interface | Computing |
| Object Manipulation Interface | Computing |
| Owner Method Invocation | Computing |
| ECOMI | Cryptocurrency |
| Oh My Irene | General |
| Operations Manager i | General |
| Oral Mucositis Index | General |
| oxygen monitor and IV | General |
| Owner Move In | General |
| Optical Modulation Index | General |
| Orthographic Motor Integration | General |
| Oocyte Maturation Inhibitor | General |
| One Man Installer | General |
| o my Irene | General |
| Optical Motion Intelligence | General |
| Obstructive Myocardial Infarction | General |
| Olympatec Meditation Institute | General |
| Overall Market Index | General |
| Operator Machine Interface | General |
| Dodge Omni | General |
| Outpouring Missions International | General |
| Organisation Maritime Internationale | General |
| Oakland Military Institute | Governmental |
| Orlando Medical Institute | Governmental |
| Office of Municipal Investigations | Governmental |
| Open Medicine Institute | Governmental |
| Operations And Maintenance Instructions | Governmental |
| Ocean- Merced- Ingleside, California | Governmental |
| Ozone Monitoring Instrument | Governmental |
| Office of Medical Investigator | Governmental |
| Old Mens Institute | Governmental |
| Operations and Maintenance Instruction | Governmental |
| Orlando Medical Institutes | Governmental |
| Office Des Migrations Internationales | International |
| Office of the Medical Investigator | Medical |
| Office of the Medical Inspector | Medical |
| Office of Medical Inspector | Medical |
| Open Medical Institute | Medical |
| Ocius Medical Informatics | Medical |
| of the Medical Investigator | Medical |