Featured Authors
Authors
= Author On Tour
- Michael O'Keeffe
- Stuart O'Keeffe
- Chris O'Leary
- Denyse O'Leary
- Michael O'Leary
- Michael O'Loughlin
- Michael J. O'Loughlin
- Sheryl O'Loughlin
- Daniel O'Malley
- Kevin O'Malley
- Mallory O'Meara
- Padraig O'Morain
- Patrick O'Neal
- Tatum O'Neal
- Henry V. O'Neil
- Sarah O'Neil
- Tom O'Neil
- Cathy O'Neill
- Heather O'Neill
- Helen O'Neill
- Kevin O'Neill
- Kim O'neill
- Laura O'Neill
- Paul O'Neill
- Poppy O'Neill
- Richard O'Neill
- Robert O'Neill
- Tony O'Neill
- Bill O'Reilly
- Brian O'Reilly
- Sean O'Reilly
- Terry O'Reilly
- Tim O'Reilly
- Dan O'Shannon
- J.P. O'Shaughnessy
- Samara O'Shea
- Colin O'Sullivan
- Kerry O'Sullivan
- Patrick O'Sullivan
- James O'Toole
- Colleen Oakes
- Cory Putman Oakes
- Stephanie Oakes
- Natasha Oakley
- Ellyn Oaksmith
- Joyce Carol Oates
- Stephen B. Oates
- Diane Oatley
- Barack Obama
- Michelle Obama
- Ellen Bryan Obed
- Alicia "Achy" Obejas
- Jim Obergefell
- Elea Oberon
- Ana Obregón
- Royal Observatory Greenwich
- Laura Obuobi
- Shirlene Obuobi
- P.J. Ochlan
- PJ Ochlan
- Joe Ochman
- Antonevia Ocho-Coultes
- Gina Ochsner
- J.W. Ocker
- Sophie Oda
- Oddbox
- Karen Odden
- Kennedy Odede
- Mohammed Odeh al-Rehaief
- Anne Odeke
- Thomas C. Oden
- Sally Odgers
- Kary Odiatu
- Uche Odiatu
- Mel Odom