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Publishers – O
- O Books
- O'Brien Press
- O'Reilly Media, Inc, USA
- Oak Archives
- Oakamoor Publishing
- Oaks Classical Christian Academy
- Oberon Books
- Ocean Reeve Publishing
- Octopod Press
- Octopus Publishing Group
- Odeion Books
- Officina Libraria
- Og Press
- Ohio State University Press
- Ohio University Press
- Ojoy Media
- Old Paths Publicationsorporated
- Old Street Publishing
- Oldcastle Books
- Olive Leaf Publications
- Olympia Publishers
- Omni Publishing
- Omnia Veritas
- Omnibus Press
- Omniscriptum
- Once Upon a Dance
- One Guitar Place
- One Love Books
- One Time Publishing
- Oneworld Publications
- Only1million
- Onomatopee
- Onslaught Press
- Onyoma Research Publications
- Open Book Publishers
- Open Court Publishing
- Open Door Publications
- Open Road Distribution
- Open Road Media
- Open Sesame Productions
- Open University Press
- Openform
- Operating System
- Opium Arts
- OR Books
- OR-TAV Music Publications
- Oracle Institute Press
- Orange Grove Books
- Orange Hippos!
- Orchid Press
- Oregon State University
- Organization for Economic Co-operation and Development
- Origin
- Original Man Productions
- Orion Books
- Orion Publishing Co
- Orphans Press
- Orpheus Academy of Music
- Oscar Dames
- Ossian Publications
- Ostara Publications
- Otago University Press
- Other Shoe Productions
- Otto Wrede Regina-Verlag
- OUP Archive
- Our Knowledge Publishing
- Our Walk in Christ Publishing
- Out of the Ark Music
- Outline Press
- Outlook Verlag
- Outpost Books
- Outskirts Press
- Over Easy Media
- Overlook Press
- Overture Publishing
- Ovolo Books
- Ovolo Publishing
- Ovolr! / Debackle
- Ovoo Production
- Owen Press
- Owl Canyon Press
- Oxford City Press
- Oxford University Press
- Oyster Point Press
- Ozaru Books
