| Abbreviation | Definition |
|---|---|
| OMS | Optical Mass Spectroscopy |
| OMT | Object Modeling Technique |
| OMVPE | Organo-Metallic Vapor Phase Epitaxy |
| ONEC | Oman National Electric Company |
| ONP | Optical Nuclear Polarization |
| OO | Object-Oriented |
| OOO | Out Of Order |
| OOPS | Out Of Phase Stereo |
| OOS | Original Out-of Straightness |
| OOS | Out Of Specification |
| OOV | Out Of Variance |
| OP | Octave Plateau |
| OPAMP | OPerational AMPlifier |
| OPBO | Output Power Back-Off |
| OPC | Optical Passive Component |
| OPC | Optimal Pressable Ceramic |
| OPC | Optimum Power Calibration |
| OPC | Optimum Power Control |
| OPC | Organic Photo Conductor |
| OPC | Originating Point Code |