Grace O at Lost Boys Press
Jenny O'Bryan at Author Self-Published
Julia O'Connell at Mysterious Press
Tara O'Connor at Berkley
Irwin O'Donnell at Harper
Shawn J. O'Gallagher at Bantam
Julia O'Halloran at Harper
Samantha O'Hara at Simon & Schuster
Nora O'Malley at Crown
Stacey O'Neale at Entangled
Bridget O'Toole at Entangled for Lovestruck
Natalie Obando at UNKNOWN
Rebecca Odell at Dutton
Hannah Ohlmann at Blackstone Publishing
Paul Ohlson at Medallion Press
Ruby Oldroyd at Collective Ink Ltd
Beth Oleniczak at Sourcebooks Fire
Paul Oliver at Soho Crime
Katie Olsen at UNKNOWN
Joseph Olshan at Delphinium
Ashley Olson at Shadow Mountain Publishing
Titi Oluwo at Swerve
Mike Onorato at Independent
Heather Orlando-Jerabek at Independent
Heather Osborn at Tor
Kaitlyn Osborn at Entangled for Select
Tala Oszkay at Dutton
Miranda Owen at Llewellyn Worldwide Ltd
Dan Ozzi at PublicAffairs
Mia O’Neill at Simon & Schuster