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Flann O'Brien

Gerry O'Brien

Robert C. O'Brien

Nick O'Donohoe

Seán O'Faoláin

Tim O'Laughlin

Patrick O'Leary

Anthony O'Neill

Darren O'Shaughnessy

Pat O'Shea

Mel Odom

Andrew J. Offutt

Ian Ogilvy

Noriko Ogiwara

Nnedi Okorafor-Mbachu

Ben Okri

Jenny Oldfield

June Oldham

Gloria Oliver

Jana G. Oliver

Lance Olsen

Kenneth Oppel

Shulamith Oppenheim

Kerry L. Orchard

Rebecca Ore

A. Orr

Joe Orton

Victor Osborne

Juliene Osborne-McKnight

Ovid

Robin D. Owens

Helen Oyeyemi

Cynthia Ozick