| The Ordinary Girl |
| The Ordinary One |
| The Organ |
| The Organ Machines |
| The Organic Convention Society |
| The Organix |
| The Organizing Committee |
| The Orgels |
| The Orginal Moonmaids Plus One |
| The Orielles |
| The Origin |
| The Original |
| The Original Blind Boys of Mississippi |
| The Original Brothers |
| The Original Carter Family |
| The Original Cast of SUDDENLY |
| The Original Cast of Zeppelin (Das Musical) |
| The Original CAT |
| The Original Clichés |
| The Original Coin |
| The Original Concept Cast of Scarlet |
| The Original Daddy Long Legs |
| The Original Death Row Eastsidaz |
| The Original DP |
| The Original Dream |
| The Original Five Blind Boys of Alabama |
| The Original Five Blind Boys of Mississippi |
| The Original Folks |
| The Original Harmony Ridge Creekdippers |
| The Original Howlin Wolf and His Orchestra |
| The Original iLLs |
| The Original J.B.s |
| The Original Memphis Five |
| The Original Pied Pipers |
| The Original Prunes |
| The Original Salty Dogs |
| The Original Silver |
| The Original Soul Seekers |
| The Original Soul Stirrers |
| The Original Tuxedo Jazz Orchestra |
| The Original Way Out |
| The Original Wildcat Jass Band |
| The Original Wolverines |
| The Originals |
| The Orioles |
| The Orion Experience |
| The Orion Smith Experience |
| The Orlons |
| The Ornaments of Bowling Green |
| THE ORO |
| The Orphan Newsboys |
| The Orphan The Poet |
| The Orphans Project |
| The Orphics |
| The Ort |
| The Orthia |
| The Orthodox Church Music Ensemble |
| The Orwells |
| The Osborne Brothers |
| The Oscar Peterson Trio |
| The Oscar Pettiford Orchestra |
| The Osmond Boys |
| The Osmond Brothers |
| The Osmonds |
| The Ossuary |
| The Oster-Welker Jazz Alliance |
| The Ostprausters |
| The Oteleks |
| The Othello Syndrome |
| The Other |
| The Other and I |
| The Other Band |
| The Other Boys in Modern Days |
| The Other Day |
| The Other Dimension |
| The Other End |
| The Other Girls |
| The Other Guys - DW X JinxCity |
| The Other Half |
| The Other Insects |
| The Other LA |
| The Other Left |
| The Other Lovers |
| The Other Ones |
| The Other Other Brothers |
| The Other Realm |
| The Other Things |
| The Other Tribe |
| The Other Two |
| The Other Way Around |
| The Otherness |
| The Others |
| The Others (Aka 22 Pistepirkko) |
| The others like us |
| The Others Me |
| The OtherSide |
| The Othersiders |
| The Otherwise |
| The Otherz |
| THE OUIJA BOARDS |
