Publishers
Every publisher in the catalog, from the majors to single-book imprints.
- Ola Olsen Lysgaard (eget forlag)
- Olaf Norlis forlag
- Olav Myhr
- Olav Tokerud (eget forlag)
- Old Gold Cigarettes
- Old School Comics
- Old Town Publishing
- Oldsmobile
- Olio
- Oliver Pezo
- Olivier Schrauwen
- Olle Berg
- Ollendorff
- Ollie Ollie! Oxen Free Press
- Ollie Schrauwen
- Olmstead Press
- Olof Siverbo
- Oloris
- Olov Norberg
- Olsen Comics
- Olsenfabrikkerna
- Olsson förlag; Stevali
- Olydri Éditions
- Olympia
- Olympia Press
- Olympian Publishing
- Olyoptics
- Omaha World-Herald
- Omaké Books
- Omega
- Omega 7
- Omelet Producties
- Ominiky Ediciones
- Ominous Press
- Ominous Press; Wizard
- Omladina
- Omladinski borac
- Omni Comics
- Omnia Verlag
- Omnibus
- Omnibus
- Omnibus Press
- Omnibus Publishing Company
- Omnimorphic Productions
- Omnipax; Imprintforlaget
- On Line
- Onapratut
- Once-Upon-a-Time Press
- Oncken Verlag
- Ondskabens Flydende Vatikan / Jernpaven & Co
- One Book Bookstore
- One Horse Leadworks
- One Peace Books
- One Percent Press
- One Pound Fire
- One Shot Press
- One Shot Productions
- One-Eyed Willgan
- One2play
- OneWay Media
- Oneiros Books
- Oneness-World Verlag
- Onesix
- Ongrys
- Oni Press
- Onix
- Onli Studios
- Ons Volk
- OnsLierBruist
- Ontario Department of Lands and Forests
- Ontario Hydro
- Ontwikkeling
- Ontwikkeling
- Onward Comics
- Onyx Cross Comics
- Oog & Blik
- Oog & Blik; De Bezige Bij
- Oog & Blik; De Harmonie
- Oog & Blik; Fantagraphics Books, Inc.
- Oogachtend
- Oogachtend; Scratch Books
- Oogachtend; Uitgeverij L
- Oogachtend; Van Halewyck
- Oogle Productions
- Ooops-Heftl
- OorlogsVerzetsMuseum Rotterdam
- Opal
- Opal Press Australia
- Opal Quill Ltd.
- Open Book Press
- Open Doors International
- Opera Graphica
- Opera Mundi
- Operation Mobilisation
- Opinion News Syndicate
- Opossum
- Oppdal Kristne Senter
- Oppi Kunstforlag
- Oppland Magasin
- Opposite Number
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