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- of Montreal - Coquelicot Asleep In the Poppies: A Variety of Whimsical Verse
- of Montreal - The Bedside Drama: A Petite Tragedy
- of Montreal - Hissing Fauna, Are You the Destroyer?
- of Montreal - The Early Four Track Recordings
- of Montreal - The Gay Parade
- Oh, Sleeper - Son of the Morning followed by
- Oh, Sleeper - Children of Fire
- OK Go - Of the Blue Colour of the Sky
- Mike Oldfield - Tubular Bells
- Mike Oldfield - Hergest Ridge
- Orchestral Manoeuvres In the Dark - Dazzle Ships
- Our Lady Peace - Spiritual Machines
- Opeth – Ghost Reveries
- Opeth – My Arms, Your Hearse
- Opeth – Still Life
- Opus Avantra - Lord Cromwell Plays Suite For Seven Vices
- Orphaned Land - Mabool
- Orphaned Land - The Never Ending Way of ORWarriOR
- Osmonds - The Plan
- Outlaws of Ravenhurst - Book I
Read more about this topic: List Of Concept Albums