| Abbreviation | Definition |
|---|---|
| OL | Open Loop |
| OL | Output Latch |
| OL | OverLay |
| OLA | Optical Line Amplifiers |
| OLAE | Organic and Large Area Electronics |
| OLB | Outer Lead Bond |
| OLE | Object Linking and Embedding |
| OLEA | Occupational Licensing Electronic Application |
| OLED | Organic Light Emitting Diode |
| OLEP | Organic Light-Emitting Polymer |
| OLRC | Open-Loop Rate Control |
| OLS | Ordinary Least Squares |
| OLT | Open Loop Testing |
| OLT | OverLoad Test |
| OLTE | Optical Line Terminal Equipment |
| OMA | Object Management Architecture |
| OMEA | Ohio Municipal Electric Association |
| OMEE | Oxide Materials for Electronic Engineering |
| OMHMS | Onboard Maintenance and Health Management System |
| OMR | Optical Music Recognizer |