| OCG | Austrian Computer Society 
| Others |
| OCG | O C G Old Country Goodness
| Others |
| OCG | Oakland Consulting Group
| Others |
| OCG | Observations Coordination Group
| Others |
| OCG | Occupational Classifications Guide
| Others |
| OCG | Oesterreichische Computer Gesellschaft
| Others |
| OCG | Of the Contractor General
| Others |
| OCG | Office of Cancer Genomics
| Others |
| OCG | Office of Charitable Gaming
| Others |
| OCG | Office of Commissioner Guidance
| Others |
| OCG | Office of Contracts and Grants
| Others |
| OCG | Office of the Contractor General
| Others |
| OCG | Official Card Game
| Others |
| OCG | Official Chess Game
| Others |
| OCG | Offline content generator
| Others |
| OCG | Oklahoma Camaro Group
| Others |
| OCG | Oktibbeha County Hospital
| Others |
| OCG | Old Chinese Guy
| Others |
| OCG | Old Courthouse Gallery
| Others |
| OCG | One Cool Guy
| Others |
| OCG | Online Computer Game
| Others |
| OCG | Open Cluster Group
| Others |
| OCG | Optical Communications Group Optical Communications Group
| Others |
| OCG | Optimal Code Generation
| Others |
| OCG | Optional Content Groups
| Others |
| OCG | Oral CholecystoGram
| Others |
| OCG | Orange Coast Gakuen
| Others |
| OCG | Orange County Guild
| Others |
| OCG | Oregon Consulting Group
| Others |
| OCG | Organised Crime Group
| Others |
| OCG | Organized Crime Group
| Others |
| OCG | Original Card Game
| Others |
| OCG | Orion Central Gateway
| Others |
| OCG | Outdoor Classroom Garden
| Others |
| OCG | Outside Counsel Guidelines
| Others |
| OCG | Owen Cheese Guild
| Others |
| OCG | Oxford Computer Group
| Others |