- O'Brien, Paul
- O'Byrne, Patrick
- O'Conor, John
- O'Conor, John/Mackerras, Charles
- O'Day, Anita
- Obradovic, Lada Project
- Ochs, Phil
- Odetta
- One Night Of Buena Vista - Castellanos, Olvido Ruiz / López, Lázara Cachao
- Orbison, Roy
- Orchestra Sinfonica Del Festival Di Pasqua
- Oregon
- Oregon, Oregon
- Orgone
- Orquesta Termidor
- Osborne, Anders
- Otis, Johnny
- Ottman, John
- Otto Normal
- Owen, Chuck & The Jazz Surge
- Ozawa, Seiji / Boston Symphony Orchestra
