Authors: P
- O'Brien, F. P. 1885-
- O'Brien, John 1878-1952
- O'Brien, Pat -1920
- O'Connor, Patrick 1915-1983
- O'Connor, T. P. (Thomas Power) 1848-1929
- O'Donoghue, Power, Mrs. 1858-
- Ogilvie, Campbell Patrick -
- O'Hegarty, P. S. (Patrick Sarsfield) 1879-1955
- Oilliamson, Jeanne de Polignac, comtesse d' 1861-1919
- 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
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