| Abbreviation | Definition |
|---|---|
| OSFB | One Step Face Base |
| OSL | Oriented Strand Lumber |
| OSM | Optivity Switch Manager |
| OSP | On Shelf Product |
| OSP | Outside Plant Prodcut |
| OSR | Optical Solar Reflector |
| OSS | Oil Sands Shovel |
| OSSC | Office Space Saving Concepts, Inc. |
| OT | Old Tools |
| OT | Open Top |
| OT | Orange Thing |
| OT | Over Technical |
| OTA | Optical Tube Assembly |
| OTAL | Offset Tactical Aiming Laser |
| OTC | Outside Threaded Container |
| OTIF | On Time In Full |
| OTLMP | Over the Limit Marketing and Production (Fort Lauderdale, FL) |
| OTM | Optivity Telephony Manager |
| OTS | Open Two Seater |
| OTSS | Outside Top Sponson Sheeting |