O
Padraig O Mealoid
Donough O'Brien
Flann O'Brien
Gerry O'Brien
James Edward O'Brien
Michael O'Brien
Robert C. O'Brien
Sean O'Brien
Ulrika O'Brien
Alex O'Connor
Rob O'Connor
Kevin O'Donnell, Jr
Lawrence O'Donnell
Maureen O'Donnell
R. C. O'Gonnam
Dan O'Hara
S. V. O'Jay
Stephen O'Kane
Alan O'Keefe
Patrick O'Leary
Daniel O'Mahony
Daniel O'Malley
Kevin O'Malley
Tim O'Neal
Steve O'Neale
Dennis O'Neil
Denny O'Neil
Gerard K. O'Neill
Joseph O'Neill
Marie O'Reagan
Ulrike O'Reilly
Darren O'Shaughnessy
Pat O'Shea
Steve Oakey
Graham Oakley
Joyce Carol Oates
Farah Obaidull
Krystyna Oborn
John October
Adrienne J. Odasso
Colin Odell
E. V. Odle
Mel Odom
Kenzaburo Oe
Andrew J. Offutt
Chris Ogden
Christopher Ogden
Mark Ogier
Axie Oh
Mariko Ohara
Arike Oke
Sue Oke
Susan Oke
Anwuli Okeke
Nnedi Okorafor
Florence Okoye
Ben Okri
Denise Okuda
Michael Okuda
Suyi Davies Okungbowa
Joseph D. Olander
Marc Olden
Ian Oldfield
Mrs A. Oldham
Paul Oldroyd
Fred Oliphant
Margaret Oliphant
Jonathan Oliver
Rosie Oliver
John Ollis
Lance Olsen
Paul F. Olson
Jerry Oltion
Vincent Omniaveritas
Nuzo Onoh
Alien Ontology
Chinelo Onwaulu
Chinelo Onwualu
Kate Onye
Kate Onyett
Yen Ooi
Andrew Openshaw
John Oram
John D. Oram
John R. Oram
Neil Oram
Stephen Oram
Steve Oram
Jerry Ordway
Douglas Orgill
Kate Orman
Dean Ormston
George Orwell
William Osborne
Gill Othen
Keith Otter
Susan Oudot
Pierre Ouellette
Chris Ould
Simon Ounsley
Christopher Owen
Frank Owen
John Owen
John D. Owen
Ray Owen
Everett Owens
Gareth Owens
P. L. Owings
Adam Oyebanji
Helen Oyeyemi