- The Osmonds -- The Other Collectors
- The Other Colors -- The Other Ones
- The Other Ones -- The Others
- The Others -- The Otters
- The Otto Keller Band -- The Outcasts
- The Outcasts -- The Outlaw
- The Outlaw Blues Band -- The Outnumbered
- The Outpatience -- The Outsiders
- The Outsiders -- The Ovationz
- The Overcomers -- The Overtures
- The Overwhelming Majority -- The Oxford & Cambridge Shakespeare Company
- The Oxford Circle -- The P Affection
- The P-Boyz -- The Pacifists of Fury
- The Pack -- The PaddyRagga Band
- The Paducah Patrol -- The Painful Leg Injuries
- The Painful Leg Injuries -- The Pala Solution
- The Palace De La Culture Du Chemin De Fer Orchestr -- The Palisades
- The Palladinos -- The Pan-Metropolitan Trio
- The Panache Orchestra -- The Panic Choir