Authors: P
- Ólafur Pálsson 1814-1876
- Old Humphrey 1787-1854
- Old Sleuth 1837-1898
- O'Leary, Peter 1839-1920
- Oliveira Martins, J. P. (Joaquim Pedro) 1845-1894
- Ollilainen, Pekka -
- Open Court Publishing Company -
- Oppenheim, E. Phillips (Edward Phillips) 1866-1946
- Orban, Paul 1896-1974
- Orcutt, Philip Dana -
- Oregon Historical Society -
- O'Rell, Max 1848-1903
- Orléans, Charlotte-Elisabeth, duchesse d' 1652-1722
- Orléans, Henri d', Prince 1867-1901
- Orth, Samuel Peter 1873-1922
- O'Shea, Kitty 1845-1921
- Osmaston, Francis Plumptre Beresford 1857-1925
- Ostaijen, Paul van 1896-1928
- Othegraven, Reinhold Pfahler von -
- Otis, Charles P. (Charles Pomeroy) 1840-1888
- Otlet, Paul 1868-1944
- Ottendorff, E. Pollak (Emil Pollak) -
- Ovid -43-17
- Owen, Charles -1746
- Owen, John 1766-1822
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