| Obtest |
| Obús |
| Ocan Siagian |
| OCB |
| Occhipinti, Roberto Orchestra |
| OCD |
| OCD: Moosh & Twist |
| Ocean |
| Ocean Alley |
| Ocean Blue |
| Ocean Colour Scene |
| Ocean Drive |
| Ocean Flaws |
| Ocean Grove |
| Ocean Is Theory |
| Ocean Music |
| Ocean Park Standoff |
| Ocean's Edge School of Worship |
| Ocean Voyager |
| Ocean Wisdom |
| Oceana |
| Oceana Justice |
| Oceana Und Kim |
| Oceanator |
| Oceanlab |
| OCEANLANE |
| Oceano |
| Oceano (metal) |
| Oceans Above |
| Oceans Ate Alaska |
| Oceans Beneath Us |
| Oceans Turn Red |
| Oceanship |
| Oceansize |
| Oceanwatters |
| Ocer y Rade |
| Ocevne |
| OchiTommy |
| Ocho |
| Ocho Drippin |
| Ocho Fabuloso |
| Ocoenia |
| Octahvia |
| Octane |
| Octave Lissner |
| Octave Minds |
| Octave Noire |
| Octave One |
| Octave One |
| Octavia |
| Octavia Harp Ensemble |
| Octavia Sperati |
| Octavian |
| October |
| October 31 |
| October Fall |
| October Flight |
| October Jonez |
| October London |
| October Project |
| October Tide |
| Octobop |
| Octopus |
| Octubre Doce |
| Octurn |
| Ocyris |
| Od |
| OD Tapo Imi |
| Odair José |
| Odalys |
| Odarama Dreams |
| Odawg |
| ODB |
| Odball |
| ODBLU |
| Odd Antonsen |
| Odd Antonsen Big Band |
| Odd Couple |
| Odd Crew |
| Odd Future |
| Odd Girl Out |
| Odd Is He |
| Odd Nordheim |
| Odd Nordstoga |
| Odd Nosdam |
| Odd Numbers |
| Odd Persons |
| Odd Project |
| Odd Spångberg |
| Odd Squad |
| Odd Squad Family |
| Oddisee |
| Oddity |
| Oddjob |
| Oddkidout |
| Oddleif Stensland |
| ODDLIQUOR |
| Oddnote |
| Oddo Bam |
| Odds |
