All authors, surname starts with O Books
Daniel O'Malley4
Eden O'Neill13
*Joyce Carol Oates202
*Patrick O'Brian44
*Anne O'Brien34
*Jenny O'Brien18
Kevin O'Brien23
Weston Ochse33
*Carol O'Connell14
 
**Carlene O'Connor11
**Karen Odden4
*Tee O'Fallon9
*Maggie O'Farrell11
**Sheila O'Flanagan39
Kate O'Hearn22
*Kristina Ohlsson10
***Janette Oke107
Megan E O'Keefe9
 
*Nnedi Okorafor23
*Nick Oldham34
*Beth O'Leary4
Caitlyn O'Leary43
Susanne O'Leary44
*Lauren Oliver26
*Lisa Oliver84
SM Olivier7
*Ollie Ollerton4
 
**Gregg Olsen60
*Melissa F Olson20
*Tricia O'Malley39
Mike Omer9
*Barbara O'Neal14
Kenneth Oppel41
E Phillips Oppenheim152
Bill O'Reilly35
Diana Orgain35
 
*Emily Organ31
George Orwell67
K E Osborn64
*Bella Osborne27
*Erin Osborne58
**Mary Pope Osborne108
Kirsten Osbourne219
Alice Oseman12
Perri O'Shaughnessy15
 
Mat Osman2
****Richard Osman3
Aaron Oster34
****James Oswald17
Abigail Owen30
Margaret Owen4
C M Owens50
*Delia Owens1
*Robin D Owens36
Sandra Owens26

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