| The Osmond Boys |
| The Osmond Brothers |
| The Osmonds |
| The Oster-Welker Jazz Alliance |
| The Other Ones |
| The Other Thing Brass Band |
| The Other Tribe |
| The Other Two |
| The Others |
| The Others (Aka 22 Pistepirkko) |
| The Out Cast |
| The Out-Islanders |
| The Outback Singers |
| The Outcast |
| The Outcasts |
| The Outfield |
| The Outfit |
| The Outhere Brothers |
| The Outlaws |
| The Outlets |
| The Outline |
| The Outpatience |
| The Outsiders |
| The Ovations |
| The Overlanders |
| The Overslept |
| The Oversoul 13 |
| The Overtones |
| The Oxford Trinity Choir |
| The Ozark Mountain Daredevils |
| The OMys |
| The P. Raney Coalition |
| The Pablo All-Stars |
| The Pacific |
| The Pacific Jazz Alliance |
| The Pacific Jazzmen |
| The Pack |
| The Pack A.D. |
| The Paddingtons |
| The Pagans |
| The Page Cavanaugh Trio |
| The Pahinui Brothers |
| The Pains of Being Pure at Heart |
| The Paint Sisters |
| The Painted Faces |
| The PAJAM Chorale |
| The Palace Brothers |
| The Palace Orchestra |
| The Paladins |
| The Pale |
| The Paley Brothers |
| The Palladium Orchestra |
| THE PAN |
| The Pandas |
| The Pandoras |
| The Panic Channel |
| The Panic Division |
| The Panics |
| the pAper chAse |
| the paper kites |
| The Paperboys |
| The Parachute Club |
| The Parade |
| The Paradons |
| The Paragon Ragtime Orchestra |
| The Paragons |
| The Parallax Orchestra |
| The Paramount Singers |
| The Paramounts |
| The Paris Sisters |
| The Parliaments |
| The Parlor Mob |
| The Parlotones |
| The Parlour Orchestra |
| The Parody Brothers |
| The Part-Time Party-Time Band |
| The Partisans |
| The Partridge Family |
| The Party |
| The Party Cats |
