Authors
- Otakar Odlozilik
- W. Odom
- S.O. Oduah
- Penelope Ody
- Waclaw Odyniec 1
- Kelly Oechsli
- Wolfgang Oehme
- Paul H. Oehser
- Helmut Oelschlager
- G.H. Oelsner
- K. Oermann
- H. Oeschger
- W.O.E. Oesterley
- J. Oesterreicher
- Dr. Oetker
- Stewart Of Cromarty
- C. Offe
- Hilda Offen
- John Offen
- Jean Offenberg
- Charles K. Offer 1
- H.S. Offler
- Richard Offner 1
- George Offor
- Ernest Ogan
- Saeko Ogasawara 1
- Maurice Edward Ogborn
- Chris Ogborne
- Christopher Ogborne 1
- Elizabeth Ogborne
- Jacqueline K. Ogburn
- Angela Ogden 2
- Bob Ogden 1
- Brian Ogden
- C.K. Ogden
- Christopher Ogden
- David Ogden
- Eric Ogden
- F. Ogden
- Jack Ogden
- James Ogden
- Jenni Ogden
- John Ogden
- Joy Ogden
- Ruth Ogden
- David Ogg
- George Ogg
- Oscar Ogg
- Robin S. Oggins
- J. Douglas Ogilby 1
- John Ogilby
- R.J.L. Ogilby
- W.R. Ogilive-Grant
- Annabel Ogilvie
- Charlotte Ogilvie
- Elisabeth Ogilvie
- F. Ogilvie
- Gordon Ogilvie
- Jean Ogilvie
- John Ogilvie
- Juliet Ogilvie
- M.A. Ogilvie
- Malcolm A. Ogilvie 1
- R.M. Ogilvie
- Robertson F. Ogilvie
- Vivian Ogilvie
- Will H. Ogilvie 4
- Maria M. Ogilvie-Gordon
- W.R. Ogilvie-Grant
- Chris Ogilvie-Herald
- Angus Ogilvy
- C. Stanley Ogilvy
- David Ogilvy 1
- Ian Ogilvy
- James S. Ogilvy 1
- Margaret Ogilvy
- Susan Ogilvy
- Noriko Ogiwara
- Josephine Ogle
- L.J. Ogle
- Richard Ogle
- Arthur Oglesby
- Miles K. Oglethorpe 1
- Bob Ogley
- J.M. Ogmore
- Molly Conner Ogorzaly
- B.A. Ogot
- Dore Ogrizek
- Alexander Ogston
- Hans C. Ohanian
- Hiroyoshi Ohashi
- Wataru Ohashi
- Hideaki Ohba 1
- Charles Talbut Ohions
- Thomas H. Ohlgren
- Jane Ohlmeyer 2
- E.E. Ohlson 1
- Lenichi Ohmae
- R.M. Ohmann
- Noriko Ohno