- The Opiates -- The Orange Peels
- The Orange Playboys -- The Orchestra of Flanders I Fiamminghi
- The Orchestra Of Jesus Ordonez -- The Ordinaires
- The Ordinance -- The Orient Express
- The Orient House Ensemble -- The Original Creators
- The Original Cyndi -- The (Original) Lost Gonzo Band
- THE ORIGINAL LP -- The Original Soul Stirrers
- The Original Sound Of Amateurs -- The Orkids
- The Orkustra -- The Osborne Sisters
- The Osbournes -- The Other Benjamin
- The Other Brother -- The Other Side
- The Other Side -- The O\u2019Farrill Brothers
- The Ouchmen -- The Outbreak