| Abbreviation | Definition |
|---|---|
| OMV | Open Market Value |
| ON | Order Number |
| ONECCA | Ordre National des Experts Comptables et Comptables Agrées du Sénégal |
| OOC | Out Of Cash |
| OOE | Other Operating Expenses |
| OOPS | Outstanding Overdraft Protection Service |
| OOR | Other Operating Revenue |
| OP | Optimum Price |
| OPB | Outstanding Principal Balance |
| OPBDIT | Operating Profit Before Depreciation, Interest, and Taxes |
| OPEX | OPerational EXpenditure |
| OPI | Open Payment Initiative |
| OPRA | Order Processing and Requisition Accelerator |
| OPSQ | Over-Payment SeQuence |
| OPSTC | Ontario Production Services Tax Credit |
| OR | Operating Result |
| OR | Operations Research |
| ORTB | Official Reserves Transactions Balance |
| OS | On Sheet |
| OSA | Office of the State Auditor |