| Abbreviation | Definition |
|---|---|
| op-amp | op-amp:operational amplifier |
| OPAS | Optical Print Alignment System |
| OPB | On-chip Peripheral Bus |
| OPC | Operator Presence Control |
| OPC | Optical Proximity Correction |
| OPGW | Overhead Power Ground Wire |
| OPH | Other People's Hardware |
| OPUS | Open Platform for Unlimited Signification |
| OPW | Optimal Performance Winding |
| ORA | Oscillator, Rectifier, and Amplifier |
| ORP | Open Runtime Platform |
| OSCAR | Optical Storage Compressed Audio Replay |
| OSCAR | Optimally SCheduled Advanced MultiprocessoR |
| OSCI | Octal Serial Communication Interface |
| OSD | Object Storage Device |
| OSD | On-screen System Display |
| OSI | Optimal System Integration |
| OSK | Operationally Soft Keyboard |
| OSS | Open Source Systems |
| OSSD | Output Signal Switching Device |