| Ohana Bam |
| Ohashi Takuya |
| Ohasis |
| Ohgeesy |
| OhGr |
| Ohio Express |
| Ohio Players |
| Ohio State University Marching Band |
| Ohio University Leading Tones |
| Ohm Guru |
| Ohm-G |
| Ohmega Watts |
| OHN |
| Ohrbooten |
| Ohta-San |
| Oi Va Voi |
| Oil |
| Oil Fox |
| Oil on Canvas |
| Oily Rags |
| Oingo Boingo |
| OJ da Juiceman |
| OJ Mariano |
| Ojete Calor |
| Ojos de Brujo |
| Ok Go |
| OK KID |
| Ok Moon |
| OKAMOTO'S |
| Okapi Guitars |
| Okasian |
| Okefenokee Orchestra |
| Okiah |
| Okid |
| Okieriete Onaodowan |
| Okí© |
| Okke Punt |
| Okkervil River |
| Okko |
| Oksana |
| Okta Logue |
| Oktay Özdemir |
| Ol Skool |
| Ol' 55 |
| Ol' dirty bastard |
| Ol' Dirty Bastard AKA Dirt McGirt |
| Ol'Kainry |
| Ola |
| Ola Åkerman |
| Ola Kvernberg |
| Ola Salo |
| Ola Svensson |
| Olaf Berger |
| Olaf Blackwood |
| Olaf Henning |
| Olaf Kübler |
| Olamide |
| OLAN |
| Olav Basoski |
| Olav Mol |
| Olavi Virta |
| Old & In the Gray |
| Old & In the Way |
| Old 97's |
| Old 97’s |
| Old and New Dreams |
| Old Blind Dogs |
| Old Chicago Blues Band |
| Old Crow Medicine Show |
| Old Dead Tree |
| Old Dominion |
| Old Fashioned Revival Hour Choir |
| Old Friends Quartet |
| Old Jawbone |
| Old Man Canyon |
| Old Man Of Name |
| Old Man's Child |
| Old News |
| Old School Freddy B |
| Old School Freight Train |
