O
| O'Brien, Barry | OK Go | Orange, The |
| O'Brien, Tim | Okkervil River | Oratory |
| O'Connell, Maura | Oksendal | Orb, The |
| O'Connor, Nora | Okuté | Orbison, Roy |
| O'Connor, P.J. | Old 97's | Orbit Service |
| O'Connor, Sinead | Old Blind Dogs | Orcas |
| O'Jays, The | Old Firm Casuals, The | Orchestral Manoeuvres In the... |
| O'Neal, Shaquille | Old No. 5's, The | Orford, Martin |
| O'Neill, Matthew | Oldfield, Mike | Origami Ghosts |
| O'Riordan, Dolores | Oldfield, Sally | Orions Belte |
| Oasis | Oleander | Orqid |
| Obenski, Amy | Olney, David | Orton, Beth |
| Oberst, Conor | Olnick, Joe | Osborne, Anders |
| Object | Olson, Mark (Mark Olson & Th... | Osbourne, Ozzy |
| Obnox | Omar And The Howlers | Oscher, Paul |
| Ocean Blue, The | Ombre | OSI |
| Ocean, Billy | Omhouse | Osmond, Donny |
| Ocean, Frank | Omni Gardens & Zen Monk Joge... | Osmond, Donny & Marie |
| Ochs, Phil | Once & Future Band | Osmonds, The |
| October Project | One Dove | OSYX, The |
| Odds, The | One High Five | Other Lives |
| Odell, Tom | One Step Away | Otis, Shuggie |
| Odonis Odonis | OneRepublic | Oumbadougou, Abdallah |
| Of Monsters And Men | Ong, Shueh-li | Out Cold |
| of Montreal | Ono, Yoko | Outkast |
| Off Ramps, The | Onore, Jeff | Over The Rhine |
| Off With Their Heads | Ontologics | Overkill |
| Office Of Future Plans | Ookla The Mok | Overloaded |
| Offspring, The | Open Head | Owen |
| OGD | Opeth | Owsley |
| Ogden, Shantell | Opprobrium | Oxcart |
| Oh Lonesome Ana | Orange 9mm | Oxys, The |
| ohGr | Orange County Supertones | Ozomatli |
| Ohlman, Christine (Christine... | Orange Goblin | Ozric Tentacles |
| Ojeda, Amber | Orange Velvets, The | |
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