Authors / illustrators / translators – O
- Monica Obniski
- Conor O'Brien
- Deborah O'Brien
- Glenn O'Brien
- Gregory O'Brien
- Margaret O'Brien
- May O'Brien
- Philippa O'Brien
- Siobhan O'Brien
- Hans Ulrich Obrist
- Judith O'Callaghan
- Lisa Occhipinti
- Joseph O'Connor
- Natalie O'Connor
- Jolie Anne O'Dell
- Sally Odgers
- Brian O'Doherty
- Anna O'Donnell
- Natalle O'Donnell
- Lauren O'Farrell
- Maggie O'Farrell
- Maki Ogawa
- Yoko Ogawa
- Jack Ogden
- Sara Ogilvie
- Guy Ogilvy
- Georgina Callan O'Hara
- John O'Hara
- Kieron O'Hara
- Karin Ohlenschlager
- Zachary Ohlman
- Dora Ohrenstein
- Kakuzo Okakura
- Bernard O'Kane
- Molly Oldfield
- Todd Oldham
- Tina Oldknow
- Catherine O'Leary
- James Oles
- Alberto Oliva
- Alison Oliver
- Narelle Oliver
- Roger Olmos
- Nadine Olonetzky
- John Olsen
- Penny Olsen
- Tim Olsen
- Barbara Olson
- Therese O'Malley
- Michael Ondaatje
- Hank O'neal
- Jane O'Neil
- Helen O'Neill
- Paul O'Neil
- Chester Ong
- Dick Onians
- Mari Ono
- Roshin Ono
- Yoko Ono
- Fiona Wirrer-George Oochunyung
- Makoto Ooka
- Julia Oparka
- Monica Oppen
- Hiawyn Oram
- Susie Orbach
- John O'Reilly
- Sally O'Reilly
- Wenda Brewster O'Reilly
- Anja Llorella Oriol
- Alexander Orloff
- Myron Orlofsky
- Patsy Orlofsky
- Jan Ormerand
- Rosalind Ormiston
- Richard Ormond
- Joseph O’Rourke
- P J O'Rourke
- Beci Orpin
- Albert Orr
- Lynn Federle Orr
- George Orwell
- Joanna Osborne
- Margot Osborne
- Peter Osbourne
- Elinor Ostrom
- Simon O'Sullivan
- Michael O'Toole
- Rebecca Otowa
- Didier Ottinger
- Matt Ottley
- Klaus Ottmann
- Dorinda Outram
- Mark Ovenden
- Cheryl Owen
- David Owen
- Joanne Owen
- Maurice Owen
- Henry Owings
- Heike Owusu
- Helen Oxenbury
- Dimitri Ozercov
