O
- 1 Oberlin, Jeremiah James
- 2 Obrecht, Ulric
- 3 Obsequens, Juuus
- 4 Occam, William Of
- 5 Occo, Adolphus
- 6 Occleve
- 7 Ocellus, Lucanus
- 8 Ochinus, Bernardin
- 9 Ockley, Simon
- 10 Odington, Walter
- 11 Odo, Saint
- 12 Odo, Cantianus
- 13 Oecolampadius, John
- 14 Oecumenius
- 15 Oeder, George Christian
- 16 Oeser, Frederic
- 17 Ofihely, Maurice
- 18 Ogden, Samuel
- 19 Ogilby, John
- 1 Oglethorpe, James Edward
- 2 Oisel, James
- 3 Okely, Francis
- 4 Okolski, Simon
- 5 Olahus, Nicholas
- 6 Olaus Magnus
- 7 Oldcastle, Sir John
- 8 Oldenburg, Henry
- 9 Oldenburger, Philip Andrew
- 10 Oldfield, Anne
- 11 Oldham, Hugh
- 12 Oldham, John
- 13 Oldisworth, William
- 14 Oldmixon, John
- 15 Oldys, William
- 16 Olearius, Adam
- 17 Olearius, Godfrey
- 18 Oleaster, Jerome
- 19 Oley, Barnabas
- 20 Oliva, Alexander
- 1 Oliva, John
- 2 Oliver, Isaac
- 3 Oliver, Peter
- 4 Olivet, Joseph Thoulier D'
- 5 Olivetan, Robert
- 6 Oliveyra, Francis Xavier De
- 7 Olivieri, Hannibal
- 8 Olympiodorus
- 9 Olzoffski, Andrew
- 10 Onkelos
- 11 Onosander
- 12 Onuphrius
- 13 Opie, John
- 14 Opitius, Henry
- 15 Opits, Martin
- 16 Oporinus, John
- 17 Oppian
- 18 Opstraet, John
- 19 Optatus
- 20 Oregius, Augustine
- 1 Oresme, Nicholas
- 2 Oribasius
- 3 Origen
- 4 Orlandini, Nicholas
- 5 Orleans, Lewis Duke Of
- 6 Orleans, Peter Joseph D'
- 7 Orme, Robert
- 8 Ormerod, Oliver
- 9 Orobio, Balthasar
- 10 Orontius
- 11 Orosius, Paul
- 12 Orpheus
- 13 Orsato, Sertorio
- 14 Orsi, John Joseph
- 15 Orsi, Francis Joseph Augustine
- 16 Orsini
- 17 Ortelius, Abraham
- 18 Orton, Job
- 19 Orville, James-Philip D'
- 20 Osborne, Francis
- 1 Osiander, Andrew
- 2 Osiander, Andrew
- 3 Osiander, John Adam
- 4 Osius, Felix
- 5 Osmund, St.
- 6 Osorio, Jerome
- 7 Osorio, Jehome
- 8 Ossat, Arnaud D'
- 9 Ostade, Adrian Van
- 10 Ostervald, John Frederick
- 11 Oswald, Erasmus
- 12 Otho Venius
- 13 Otho Of Frisingen
- 14 Ott, John Henry
- 15 Otto
- 16 Otway, Thomas
- 17 Oudin, Casimir
- 18 Oudin, Francis
- 19 Oughtred, William
- 20 Ousel, Philip
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