Authors
- Hugh Orton 2
- Joe Orton
- Len Ortzen
- Professor N. Orui
- Charles F. Orvis
- George Orwell 1
- Christabel S. Orwin
- Donna Tussing Orwin
- Pascal Ory
- Grace Orzech
- Morris Orzech
- George Osbaldeston
- Gillian Osband
- Linda Osband
- Osborn
- A. Osborn
- Alex Osborn
- Arthur W. Osborn
- E.B. Osborn
- Fred M. Osborn
- Frederic J. Osborn
- Fredrick Osborn
- Gordon Osborn
- H. Muriel Osborn
- L. Osborn
- Mary Osborn
- Yotty Osborn 2
- A.L. Osborne
- Alan Osborne
- Albert B. Osborne
- Bernal Osborne
- Brian D. Osborne
- C.H.C. Osborne
- Captain Osborne
- Charles Osborne
- Christine Osborne
- D.G. Osborne
- Dorothy Osborne
- Edgar Osborne 1
- Eileen Osborne
- Eric N. Osborne
- G.O. Osborne
- Graham Osborne
- Harold Osborne
- Honor Osborne
- James Osborne
- John Osborne
- June Osborne
- Keith Osborne
- Kevin Osborne 1
- Linda Barrett Osborne
- Margaret Osborne
- Margherita O. Osborne
- Mary Pope Osborne
- Milton Osborne
- Nancy Cabot Osborne 1
- P. Osborne
- Paul Osborne
- Peter Osborne
- Richard Osborne
- Robin Osborne
- Susan Osborne 1
- Victor Osborne
- W.C. Osborne
- Wendy Osborne
- D.G. Osborne-Jones
- J. Osbornova
- H.J.L. Osbourn
- LLoyd Osbourne
- M. Osbourne
- Ozzy Osbourne
- Roger Osbourne
- Joseph Osburn
- Giorgio Osculati
- Fritz K. Oser
- Fanny Osgood
- I. Osgood
- William F. Osgood
- Osho
- Alison Osius
- O. Oskarsson
- Frank Oski
- Adrian G. Osler
- Dorothy Osler
- Mirabel Osler
- A.S. Osley
- A.H. Osman
- C.A.E. Osman
- Colin Osman
- W.H. Osman
- W.C. Osman-Hill
- Henry A. Osmaston
- W. Osmer
- Edward Osmond
- J.S. Osmond
- John Osmond
- Laurie Osmond
- Nigel Osner
- Ossian
- C.V. Ossietzky