Oakes, Sharon
Oates, Debbie
Obano, Rex
Oberman, Tracy-Ann
Oberman, Wendy
Obreht, Tea
O'Brian, Patrick
O'Brien, Edna
O'Brien, Kate
O'Brien, Martin
O'Brien, Sean
Ochsner, Gina
O'Carroll, Harriet
O'Connor, Denis
O'Connor, Anne-Marie 
O'Connor, Joseph
Odd Body
Odell, Michael
O'Farrell, John
O'Farrell, Maggie
O'Flynn, Catherine

Ogin, Gary
Oglesby, Tamsin
O'Hagan, Andrew
O'Hanlon, Jim
O'Hara, Frank
O'Hara, John
Okafor, Ben and Justin Butcher
Okoh, Janice
Okri, Ben
Olafsson, Olaf
Oliphant, Margaret
Oliver, Louise
Ondaatje, Michael
O'Neill, James, and Eamon O'Neill and Martin Shea
O'Neill, Richard Rai
O'Nolan, Brian
Oo, Kin Swe
Oppel, Jean-Hugues
Oppersdorff, Rosomond
Orchard, Sonia
Orczy, Baroness
O'Reilly, Christian

O'Reilly, Judith
O'Reilly, Kaite
Orenstein, Peggy
The Original Writer's Group, Battersea
Orkin, Laurence
Orr, K J
Orton, Joe
Orwell, George
Osbaldeston, Joan
Osborne, John
Osborne, Lisa
O’Shea, Moira
O'Sullivan, Matthew
Oswald, Alice
Otten, Willem Jan
Owen, Gary
Owen, Wilfred
Oyeyemi, Helen
Oz, Amos
Ozumba, Kachi A