| Abbreviation | Definition |
|---|---|
| OJE | Otsego Jazz Ensemble |
| OJF | Organic Junk Fude |
| OJF | Osmosis Jones Fanlisting |
| OJJB | Ottawa Junior Jazz Band |
| OJL | Origin Jazz Library |
| OJM | Orchestra de Jazz Matosinhos |
| OJM | Orquestra Jazz de Matosinhos |
| OJM | Orquestra Jazz Matosinhos |
| OJS | Orchestre des Jeunes de Strasbourg |
| OJT | Organ Jazz Trio |
| OJW | Oaktown Jazz Workshop |
| OK | Ola Kala (all is alright) |
| OKO | OK Orchestra |
| OLGA | On Line Guitar Archive |
| OLO | Ohio Light Opera |
| OLTB | Old Lyme Town Band |
| OM | Orchestra Model |
| OM | Orchestral Manoeuvres |
| OM | Orchestral Model |
| OM | Original Music |