OakTara (formerly Capstone Fiction) (Jeff Nesbit, Ramona Tucker) Link

Oak Tree Press (Billie Johnson) Link

Obsidian Mountain Publishing (Revolution Publishing) (Brenda Pandos, Laura Kreitzer) Link

Oceanview Publishing (Bob Gussia) Link

Oculus Media Group, LLC (Aisling Press, Brann Publishing, Cairn Media Services) (Bo Savino) Link

Odyssey Books Pty Ltd. (Michelle Lovi) Link

œ Off the Wall Plays (Claire Demmer) Link

Oftomes Publishing (Benjamin Alderson) Link

Oghma Creative Media (Foyle, Liffey, Meath, et al.) (Casey Cowan) Link

Oktopus Ink (Emily London) Link

Old American Publishing (Mark Stepp) Link

Old Line Publishing, LLC (Craig Schenning) Link

Old Stone Press (div. of J.H. Clark & Associates, Inc.) Link

Ą Oloris Publishing (Silver Leaves) (L. Lara Sookoo, Julie Dobbins) Link

Olympia Publishers (div. of Ashwell Publishers Ltd. Co.) (Bu-Azal Bedar, Mohammed Bu-Malik) Link

Ą œ OMNI (OMNI Reboot) Link

Ą Omnidawn Publishing (OmniVerse) (Rusty Morrison, Ken Keegan) Link

Ą Omnific Publishing, LLC (Elizabeth Harper-Riley) Link

Ą Omnium Gatherum (Kate Jonez) Link

Once Upon A Time Magazine (Audrey Baird) Link

One Body Press (Todd Uebele) Link

Ą One Story, Inc. (One Teen Story) (Hannah Tinti, Maribeth Batcha) Link

Oneworld Publications (Point Blank, Rock the Boat) (Juliet Mabey, Novin Dooster) Link

Onlywomen Press Ltd. (Lilian Mohin) Link

OnStage Publishing, LLC (Dianne Hamilton) Link

Ą Onyx Neon Press, Inc. (Cifiscape, Onyx Neon Shorts) (Allison Randal) Link

Ooligan Press (div. of Portland State Univ.) Link

Open Book Press (div. of Dark Dance Productions, LLC) Link

Open Door Publications (Karen Hodges Miller) Link

Open Door Publishers, Inc. (Ladean Warner, Joseph Adamiszyn) Link

œ Open Road Integrated Media, Inc. (Jane Friedman, Jeffery Sharp) Link

Ophelia House Publishing, Inc. (Rebecca Taylor) Link

Opinion Guy, The (OG’s Speculative Fiction Magazine) (div. of Golden Acorn Press) (Seth Crossman) Link

Ą Optimist, The (formerly The Intelligent Optimist, Ode Magazine) (Jurriaan Kamp) Link

OpusExpo, Inc. (Aaron Shapland, Jessica Robertshaw) Link

Oracle Stories & Letters (Obi Harrison Ekwonna) Link

Orca Book Publishers (Bob Tyrrell) Link

Orchard House Press Ltd. (Fandom Press, Paper Frog, et al.) (formerly Windstorm Creative, Pride & Imports) (Jennifer & Cris DiMarco) Link

Original Writing Ltd. (Andrew, Marie & Martin Delany) (Link

Orion Publishing Group, The (Gateway, Gollancz, Trapeze, et al.) Link

Oshun Publishing Co. (Oshun Literary, Oshun Press) (Karen Quinones Miller) Link

Osiail Publishing, LLC (Phil McGrail, Josiah Eikelboom) Link

Osprey Publishing Ltd. (Shire Publications) (div. of Bloomsbury as of ’14) Link

Ą O, The Oprah Magazine Link

Ą Other Press (Judith Gurewich, Michael Moskowitz) Link

Ą œ Other Publishing Company, The (Cracked Eye (formerly LitBits)) Link

Other Side of the Badge Magazine (Tiffany Colter) Link

Otherworld Publications (Lynn Calvert) Link

œ Ourboox (Mel Rosenberg, Ran Shternin) Link

Outer Banks Publishing Group (Anthony Policastro) Link

Ą