Authors
- Dennis Ortenburger 1
- Hugh Orton 2
- Charles F. Orvis 1
- George Orwell 1
- Yotty Osborn 2
- Edgar Osborne 1
- Kevin Osborne 1
- Nancy Cabot Osborne 1
- Peter Osborne 1
- Susan Osborne 1
- Nicholas Ostler 1
- Yvonne Ostroga 1
- Charles W. Ostrom 1
- Werner Oswald 1
- Ricardo Otheguy 1
- David Ottewill 1
- George Ottley 1
- Reginald Ottley 1
- Ouida 1
- Hermon Ould 1
- Ourselves 1
- Ian Ousby 1
- R.F. Outcault 2
- Ida Renthal Outhwaite 1
- T. Donald Overfield 1
- Ruth Overman 1
- R.J. Overy 2
- Rasmus Ovesen 1
- J.D. Ovington 1
- Bryn Owen 1
- Charles Owen 1
- David Owen 2
- David E. Owen 1
- Dorothy M. Owen 1
- Eleanor J. Owen 1
- Gareth Owen 1
- George Owen 2
- Geraint Dyfnallt Owen 1
- Griffith Owen 1
- Guillermo Owen 2
- Henry Owen 1
- Hugh Owen 3
- Loris Owen 1
- Myrfyn Owen 1
- Tony Owen 1
- Will Owen 1
- Victoria Owens 2
- W.R. Owens 1
- Doug Owram 1
- Sibyl B. Owsley 5
- Helen Oxenbury 3
- Edward Oxenford 1
- Elsie J. Oxenham 100
- John Oxenham 2
- Eric Oxenstierna 1
- Alan Oxley 1
- Mat Oxley 1
- Panama Oxridge 2