| Abbreviation | Definition |
|---|---|
| OECC | Optometric Eye Care Center |
| OECC | Optometric Eye Care Centers |
| OECC | Ouachita Electric Cooperative Corporation |
| OECL | Omagh Enterprise Company Limited |
| OEF | Oregon Entrepreneurs Forum |
| OEF | Oxford Economic Forecasting, Ltd. |
| OEH | Osaka English House |
| OEHI | Occidental of Elk Hills Inc |
| OEHS | Occupational and Environmental Health Sciences |
| OEI | Oates Energy Inc |
| OEI | Original Equipment Industries |
| OEIC | Open Ended Investment Company |
| OEIC | Oriental Electric Industry Company, Limited |
| OEJ | Ohioedge Enterprise Java Solutions |
| OEL | Ontario Electrical League |
| OEL | Osborne Engineering Ltd |
| OEM | Osaka Electronics Maintenance |
| OEMC | Ocmulgee Electric Membership Corporation |
| OEMT | Oneok Energy Marketing and Trading |
| OEN | Ontario Energy Network |