| Abbreviation | Definition |
|---|---|
| OCSG | Oracle Communications Services Gatekeeper |
| ODA | Office Document Architecture |
| ODC | Organizational Domain Controller |
| ODCN | Optical and Data Center Network |
| ODF | Optical Distribution Frame |
| ODIN | Open Document Image Network |
| ODMR | On Demand Mail Relay |
| ODN | On-Demand Network |
| ODN | Optical Data Network |
| ODN | Optical Distribution Network |
| ODP | Open Distributed Processing |
| OE | Over Ethernet |
| OEB | Open E Book |
| OES | Online Evalueation System |
| OES | Outbound Email System |
| O-F | On File |
| OFC | Optical Fiber Communication |
| OFDI | Optical Frequency Domain Imaging |
| OFDMA | Orthogonal Frequency Division Multiple Access |
| OFDS | Old Fashioned Disk Swapping |