| Acronym | Definition |
|---|
| OMC | Organisation Mondiale du Commerce (French: WTO) |
| OMC | Organización Mundial del Comercio (Spanish: World Trade Organization) |
| OMC | Organização Mundial do Comércio (Portuguese: World Trade Organization) |
| OMC | Organic (polymer) Matrix Composite |
| OMC | Open Method of Coordination (EU) |
| OMC | Organizzazione Mondiale del Commercio (Italian: World Trade Organization) |
| OMC | Oregon Mountain Community (Portland, OR retailer) |
| OMC | Outboard Marine Corporation |
| OMC | On My Computer |
| OMC | Open Market Committee |
| OMC | Orion Molecular Cloud |
| OMC | Office of Motor Carriers |
| OMC | Optimum Moisture Content |
| OMC | Operations and Maintenance Center |
| OMC | Office of Military Cooperation |
| OMC | Old Man's Child (band) |
| OMC | Ostiomeatal Complex (otolaryngology) |
| OMC | Office of Managed Care |
| OMC | Otara Millionaires Club (musical artist) |
| OMC | Oman Medical College |
| OMC | Original Male Character |
| OMC | Office of Munitions Control |
| OMC | Outboard Motor Corporation |
| OMC | Optical Media Converter |
| OMC | Oakland Municipal Code (California) |
| OMC | Operation and Maintenance Costs |
| OMC | one-man clan |
| OMC | Orissa Mining Corporation Ltd. |
| OMC | Oh My Carlisle! |
| OMC | Organizational Member Council (ANSI term) |
| OMC | Oh My Cullen (Twilight fan slang) |
| OMC | Operations/Maintenance Coordinator |
| OMC | Oneness Mission Club |
| OMC | Order Management Center |
| OMC | Operation and Management Center |
| OMC | organic molecular crystal |
| OMC | Oman Methanol Company LLC |
| OMC | Ontario Medal for Good Citizenship |
| OMC | Orchard Machinery Corporation (Yuba City, CA) |
| OMC | One-Man Control |
| OMC | Olszak Management Consulting, Inc. |
| OMC | Office of Management Controls |
| OMC | Chief Opticalman (Naval Rating) |
| OMC | Optic/Millimeter-wave Converter |
| OMC | Online Medical Control (Canadian Coast Guard, Rescue Specialist) |
| OMC | Orinoco Mining Company |
| OMC | Operation and Maintenance Cell |
| OMC | Orbitel Mobile Communications Ltd. |
| OMC | Occupational Measurement Center |
| OMC | Order of Friars Minor Conventual |
| OMC | Optical Moisture Content (materials engineering) |
| OMC | Old Mill Century |
| OMC | Outer Membranes Complex |
| OMC | Optical Media Center (Broadwing) |
| OMC | Optical Multiplexed Carrier |
| OMC | Oh My Chaos (humor) |
| OMC | Other Management Controllable |
| OMC | Ordered Macroporous Carbon |
| OMC | Organizational Maintenance Concept |
| OMC | Optimisation and Measurement Center |
| OMC | Optical Memory Card |
| OMC | Osteopathic Medical Center (various locations) |
| OMC | Outpatient Medical Care (various locations) |
| OMC | Oncology Management Consulting Group (Pennsylvania) |
| OMC | Orange Mound Collaborative (Memphis, TN) |
| OMC | Our Missing Children (Canada) |
| OMC | Occupational Medicine Center |
| OMC | Open Music Contest |
| OMC | Opel Motorsport Club (car club) |