| Rank | Abbreviation | Meaning |
|---|
| ***** | OMAC | Operation Maintenance Administration and Control
| |
| ***** | OMAC | Organization for Machine Automation and Control
| |
| ***** | OMAC | Oman Airports Management Company
| |
| **** | OMAC | Once A Month Cooking
| |
| **** | OMAC | Old Man's Aircraft Company
| |
| **** | OMAC | One Man Army Corps
| |
| *** | OMAC | Organisational Member of the Association for Coaching
| |
| ** | OMAC | Opposed Migration Aerosol Classifier
| |
| ** | OMAC | One Million and Counting
| |
| * | OMAC | One-Key CBC Mac
| |
| * | OMAC | Otara Music Art Centre
| |
| * | OMAC | Open Modular Architecture Control
| |
| * | OMAC | otitis media, acute catarrhal
| |
| * | OMAC | Open Modular Architectural Controls
| |
| * | OMAC | Office of Multicultural Affairs and Citizenship
| |
| * | OMAC | Outdoor Marketing Association of Canada
| |
| * | OMAC | Ocala Municipal Arts Commission
| |
| * | OMAC | Observational Metahuman Activity Construct
| |
| * | OMAC | Occupational Medical Association of Canada
| |
| * | OMAC | Office of Management and Communications
| |
| * | OMAC | Optical Media Access Control
| |
| * | OMAC | Ohio Municipal Advisory Council
| |
| * | OMAC | Orlando Modern Art Collection
| |
| * | OMAC | Old Mutual Actuaries Consultants
| |
| * | OMAC | Orange Model Aircraft Club
| |