| O&MC | Operation and Maintenance Cost 
| Others |
| OMC | Oakey Motorsport Club
| Others |
| OMC | Oakland Mediation Center
| Others |
| OMC | Oakland Motor Car Company
| Others |
| OMC | Oblivion Message Central
| Others |
| OMC | Obscene Message to Console
| Others |
| OMC | Observer Member Of The Crew
| Others |
| OMC | Odhisa Mining Corporation
| Others |
| OMC | Odisha Mining Corporation
| Others |
| OMC | Office Machine Consultants
| Others |
| OMC | Office of Managed Care
| Others |
| OMC | Office of Marine Conservation
| Others |
| OMC | Office of Marketing and Communications
| Others |
| OMC | Office of Medical Cannabidiol
| Others |
| OMC | Office of Military Cooperation
| Others |
| OMC | Office of Motor Carriers
| Others |
| OMC | Office of Munitions Control
| Others |
| OMC | Official Millionaires Club
| Others |
| OMC | Offshore Mediterranean Conference
| Others |
| OMC | Oh Margaret Campbell
| Others |
| OMC | Oh My Carlisle
| Others |
| OMC | Oh My Cat!!
| Others |
| OMC | Oh My Clamps
| Others |
| OMC | Oh My Cod
| Others |
| OMC | Oh My Country
| Others |
| OMC | Ohio Musclecar Challenge
| Others |
| OMC | Oil Marketing Companies
| Others |
| OMC | Oil Marketing Company
| Others |
| OMC | Oink Moo And Cluck
| Others |
| OMC | Oink Moo Cluck
| Others |
| OMC | Okahandja Motor Club
| Others |
| OMC | Oklahoma Motorsports Club
| Others |
| OMC | Oklahoma Motorsports Complex
| Others |
| OMC | Oklahoma Mustang Club
| Others |
| OMC | Old Man Clan
| Others |
| OMC | Old Mans Clan
| Others |
| OMC | Old Mens' Club
| Others |
| OMC | Old Middle Cator
| Others |
| OMC | Old Mine Cut
| Others |
| OMC | Old Motors Club
| Others |
| OMC | Olitaire Millionaires Club
| Others |
| OMC | Olmsted Medical Center
| Others |
| OMC | Olmsted Medical Clinic
| Others |
| OMC | Olympic Medical Center
| Others |
| OMC | Olympic Medical Centre
| Others |
| OMC | OM Chanting
| Others |
| OMC | Omni Custom
| Others |
| OMC | On Mission Celebration
| Others |
| OMC | On-line Map Creation
| Others |
| OMC | One Man Clan
| Others |
| OMC | One Man Crew
| Others |
| OMC | Online Map Creation
| Others |
| OMC | Online Marketing Challenge
| Others |
| OMC | Online Marketing Consultant
| Others |
| OMC | Online Marketing Consultants
| Others |
| OMC | Ontario Mustang Club
| Others |
| OMC | Opel Motorsport Club
| Others |
| OMC | Open Metaverse Currency
| Others |
| OMC | Open method of coordination
| Others |
| OMC | Open Mobility Cloud
| Others |
| OMC | OpenSSL Management Committee
| Group, Technology, Security |
| OMC | Operation and Maintenance Center
| Others |
| OMC | Operation and Maintenance Console
| Others |
| OMC | Operation and Maintenance Costs
| Others |
| OMC | Operation Machina Counterfeit
| Others |
| OMC | Operations and Maintenance Center
| Others |
| OMC | Operations Management Center
| Others |
| OMC | Opportunity Management Center
| Others |
| OMC | Optical Management Channel
| Others |
| OMC | Optical Media Converter
| Others |
| OMC | Optical Memory Card
| Others |
| OMC | Optical Microscopy Core
| Others |
| OMC | Optical Monitoring Camera
| Others |
| OMC | Optical Multi-Channel
| Others |
| OMC | Optical Multiplexer Chassis
| Others |
| OMC | Opticalman Chief Petty Officer
| Others |
| OMC | Oracle Management Cloud
| Others |
| OMC | Oracle Marketing Cloud
| Others |
| OMC | Orbitel Mobile Communications
| Others |
| OMC | Orbiter Maintenance and Checkout
| Others |
| OMC | Orchard Machinery Corporation
| Others |
| OMC | Order My Casket
| Others |
| OMC | Oregon Midwifery Council
| Others |
| OMC | Oregon Mountain Community
| Others |
| OMC | Organisation Mondiale Coiffure
| Others |
| OMC | Organisation Mondiale de Commerce
| Others |
| OMC | Organisation mondiale du commerce
| Others |
| OMC | Organizacisn Mundial Comercio
| Others |
| OMC | Organize Mass Chaos
| Others |
| OMC | Organized Mass Chaos
| Others |
| OMC | Organized Mass Choas
| Others |
| OMC | Organometallics Materials and Catalysis
| Others |
| OMC | Oriental Motors Company
| Others |
| OMC | Orientation Main Committee
| Others |
| OMC | Original Male Character
| Others |
| OMC | Original Motor Club
| Others |
| OMC | Orion Molecular Cloud
| Others |
| OMC | Orissa Mining Corporation
| Others |
| OMC | Osceola Medical Center
| Others |
| OMC | Otagiri Manufacturing Company
| Others |
| OMC | Otara Millionaires Club
| Others |
| OMC | Otara Millionnaire's Club
| Others |
| OMC | Other Moisture Content
| Others |
| OMC | Ottawa Mini Club
| Others |
| OMC | Ottawa Mustang Club
| Others |
| OMC | Our Man Clay
| Others |
| OMC | Our Mother of Consolation
| Others |
| OMC | Outboard Marine Company
| Others |
| OMC | Outboard Marine Corporation
| Others |
| OMC | Outboard Marine Corpration
| Others |
| OMC | Outboard Motor Company
| Others |
| OMC | Outboard Motor Corporation
| Others |
| OMC | Outlaws Motorcycle Club
| Others |
| OMC | Overnite and Motor Cargo
| Others |
| OMC | Owner May Carry
| Others |
| OMC | Owyhee Motorcycle Club
| Others |
| OMC | Oxford Ministry Course
| Others |
| OMC | Ozarks Medical Center
| Others |
| OMC | Ozarks Multisport Club
| Others |