All authors, surname starts with O Books
*Eden O'Neill13
Elizabeth O'Roark12
*Joyce Carol Oates202
*Patrick O'Brian44
*Anne O'Brien34
*Jenny O'Brien19
Kevin O'Brien23
*Carol O'Connell14
Bryce O'Connor11
**Carlene O'Connor12
 
*Karen Odden4
*Tee O'Fallon9
*Maggie O'Farrell11
Chris Offutt9
Jason Offutt9
*Sheila O'Flanagan39
G J Ogden40
*Kate O'Hearn22
*Kristina Ohlsson10
**Janette Oke107
 
*Nnedi Okorafor23
*Nick Oldham34
*Beth O'Leary4
Caitlyn O'Leary43
Susanne O'Leary44
*Kelly Oliver15
*Lauren Oliver26
Lisa Oliver86
SM Olivier7
*Ollie Ollerton4
 
**Gregg Olsen61
*Melissa F Olson20
Peter O'Mahoney25
*Tricia O'Malley41
Mike Omer9
*Barbara O'Neal14
Baroness Orczy50
Bill O'Reilly36
*Diana Orgain35
*Emily Organ32
 
George Orwell67
K E Osborn65
*Bella Osborne27
*Erin Osborne59
**Mary Pope Osborne109
Kirsten Osbourne219
Alice Oseman12
Perri O'Shaughnessy15
Mat Osman2
****Richard Osman3
 
Aaron Oster34
***James Oswald17
Sean Oswald11
Abigail Owen33
Margaret Owen4
C M Owens50
*Delia Owens1
*Robin D Owens36
*Sandra Owens26

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