| Abbreviation | Definition |
|---|---|
| OMS | Online Marketing Summit |
| OMSC | Office of Marketing Strategic Communications |
| OMSG | Orbital Marketing Services Group |
| OOMCO | Oman Oil Marketing Company (est. 2003) |
| OPM | Online Performance Marketing |
| OPSI | Opening Purchases Sales Inventory |
| ORM | Online Relationship Marketing |
| OS | Online Seeding |
| OSAM | Outsourced Sales And Marketing |
| OSD | One Shot Deal |
| OSMA | Ontario Sheep Marketing Agency |
| OSRR | Online Shopping Realtime Rating |
| OSSP | Outsourced Services and Support Provider |
| OTLMP | Over the Limit Marketing and Production (Fort Lauderdale, FL) |
| OTM | On The Money |
| OTN | Old To New |
| OTW | Optimistic Trained Wright |
| OWMG | Outsmart World Marketing Group |
| OWMS | Online Web Marketing Solution |
| PAAS | Product As A Service |