| Abbreviation | Definition |
|---|---|
| OCTMS | Owl City The Midsummer Station |
| OD | One Direction |
| ODCB | Old Dam Community Band |
| ODIM | Other Dimensions In Music |
| ODJB | Original Dixieland Jass Band |
| ODJB | Original Dixieland Jazz Band |
| ODMF | Organic Dance Music Festival |
| ODSB | Optical Double Side Band |
| OEK | Orchestra Ensemble Kanazawa |
| OELA | Oats Electric Light Orchestra |
| OF | Odd Future |
| OFD | Originally From Dorchester |
| OFFAL | Orchestra For Females And Laptops |
| OFMG | One Famm Music Group |
| OFQ | Old Friends Quartet |
| OFS | Our Favorite Soprano |
| OFT | Oil Field Trash |
| OFWKTA | Odd Future Wolf Gang Kill Them All |
| OFY | Opera for the Young |
| OFY | Opportunities for Youth Productions |