| Abbreviation | Definition |
|---|---|
| OEP | Original Engineered Products, Inc. |
| OEPC | Okinawa Electric Power Company |
| OEPL | Online Encounters Pty Ltd |
| OER | Optical & Electronic Research, Inc. |
| OER | Optical & Electronic Research, Incorporated |
| OER | Original Equipment Reproduction |
| OES | Old English Sheepdog Stamps |
| OESI | Ohio Environmental Services Industries |
| OESI | Omaha Electric Service, Inc. |
| OESL | Offshore Employment Solutions Ltd |
| OETC | Oman Electricity Transmission Company |
| OEW | One Eyed Willie's |
| OEX | Overland EXperts |
| OF | Oppenheimer Funds |
| OFAC | Ontario Farm Animal Council |
| OFAR | Oscar Faber Applied Research |
| OFB | Ohio Farm Bureau |
| OFB | Oklahoma Farm Bureau |
| OFB | One Fast Buffalo Co. |
| OFBC | Old Forge Brewing Company |