| Abbreviation | Definition |
|---|---|
| OM&M | Of Mice Men |
| OM&M | Of Mice & Men |
| OMAG | Oberlin Music at Grafton |
| OMAM | Of Monsters and Men |
| OMB | One Man Band |
| OMB | One Mand Band |
| OMD | On-line Music Distribution |
| OMD | Orchestral Manoeuvres in the Dark |
| OMF | Ontario Music Fund |
| OMFUG | Other Music For Uplifting Gormandizers |
| OMG | Oh My Grohl |
| OMGBLAHBT | Oh My God Becky Look At Her Butt Tunechi |
| OMI | Open Music Initiative |
| OMJ | Off My Jammy`s |
| OMJ | One Man Jam Guitar |
| OMMC | Ontario Mennonite Music Camp |
| OMN | Overtone Music Network |
| OMOW | One Music One World |
| OMP | Orbital Music Park |
| OMR | Oh My Ringo |