| Abbreviation | Definition |
|---|---|
| OBI | Open Biodiversity Informatics |
| OBM | Object- Behavior Model |
| OBP | Open Boot PROM ( Programmable Read Only Memory) |
| OCA | Over Clocker's Addiction |
| OCASE | Ontario Computer Animation & Special Effects Tax Credit |
| OCD | Oil Conservation Division |
| OCG | Of the Contractor General |
| OCL | Object Communication Model |
| OCM | Object Communication Model |
| OCM | Ole Control Message |
| OCM | Omis Compliant Monitoring |
| OCM | Online Call Management |
| OCM | Operating Computer Module |
| OCP | Overclockers Comparisson Page |
| OCR | Online Computer Retrieval |
| OCS | Output Control Software |
| OCU | Objective C Use |
| OCU | Optical Character Unit |
| OCX | OLE Control Extension |
| OD | Open Diary |