| Abbreviation | Definition |
|---|---|
| OCLS | Orange County Library System |
| OCPL | Oak Creek Public Library |
| OCPL | Oconee County Public Library |
| OCPL | Ohio County Public Library |
| OCPL | Onondaga County Public Libraries |
| OCPL | Onondaga County Public Library |
| OCPL | Orange County Public Library |
| OCPLC | Okaloosa County Public Library Cooperative |
| ODI | Open Discovery Initiative |
| ODL | OK Dept of Libraries |
| ODL | Operator Discretization Library |
| ODLF | Oxford Digital Library for Forestry |
| ODSL | On Demand Subscription Library |
| OEB | Open Electronic Book |
| OECL | Open EDA Component Library |
| OFC | On the Fly Cataloguing |
| OGL | Object Graphics Library |
| OGL | Office Graphics Library |
| OGNL | Object Graph Navigation Library |
| OHA | Oxfordshire Health Archives |