Authors
- Barbara Milo Ohrbach
- Bengt Ohrelius
- Dominik Ohrem
- Jisaburo Ohwi
- Yoshi Oida
- Makoto Oishi
- S. Oishi
- Oistros
- Pandit Gopesh Kumar Ojha
- George C. Oke
- Janette Oke
- T.R. Oke
- Judith Okely
- A. Oken
- Thomas Okey 1
- Howard Pitcher Okie
- Ben Okri
- Bernt Oksendal 1
- Denise Okuda
- Michael Okuda
- Daniel A. Okun
- Frederick A. Olafson
- Gudmundur Pall Olafsson
- Judy Olausen
- Lars Olausson
- Charles S. Olcott 1
- Frances Jenkins Olcott
- L. Olcott
- Virginia Olcott
- William Tyler Olcott
- Old Hand
- Old Humphrey
- Old Sleuth
- old Time
- Susan Oldacre
- Adrienne Oldale
- Peter Oldale
- Derek Oldbury
- Anthony Olden
- Ingrid Olden
- M. Olden
- Rudolf Olden
- Zoe Oldenbourg
- Oldenburg
- Veena Taiwar Oldenburg
- Effin Older
- Jules Older
- Anne Oldfield
- F. Oldfield
- Geoffrey Oldfield
- Harry Oldfield
- Jenny Oldfield 1
- John Briton Oldfield
- Mary Oldfield
- Pamela Oldfield
- Paul Oldfield 1
- R.C. Oldfield
- R.W. Oldfield
- Rosamund Oldfield
- Sue Oldfield
- Tracy Oldfield
- Claire Oldham
- Eric Oldham
- Hilda Walley Oldham
- J.B. Oldham
- James Oldham
- Jan Oldham
- Jeffrey Oldham
- June Oldham
- Kenneth Oldham
- Mary Oldham
- Michael Oldham
- Tony Oldham
- Wilton J. Oldham
- Frank Olding
- Ernest Oldmeadow
- Katharine Oldmeadow 3
- David Oldrey
- John Oldridge
- Harold Oldroyd
- C.D. Olds
- Robert Olds
- Sharon Olds
- Eva Oledzka
- Michel Oleffe 7
- Mogens Norgaard Olesen
- Thomas N. Olesen
- Yuri Olesha
- Frank Oleski
- Douglas B. Oliff
- Richard Oliff
- Kalevi Olin
- Laurie Olin 1
- Wally Olins
- Lancelot Oliphant
- Laurence Kington Oliphant
- Mrs Oliphant
- Achille Bonito Oliva 1
- Manuel Lopez Oliva
- Pavel Oliva