Authors: O
- Orban, Victor 1868-1946
- Orbeck, Anders 1891-
- Orbigny, Alcide Dessalines d' 1802-1857
- Orchard, Thomas Nathaniel -
- Orchard, W. E. (William Edwin) 1877-1955
- Orcutt, Philip Dana -
- Orcutt, William Dana 1870-1953
- Orczy, Emmuska Orczy, Baroness 1865-1947
- Order of the Eastern Star. General Grand Chapter -
- Ord, G. W. -
- Ordine della Santissima Annunziata -
- Ordonneau, Maurice 1854-1916
- Ordway, Edith B. (Edith Bertha) 1877-1944
- O'Regan, Jimmy -
- Oregon Historical Society -
- O'Reilly, A. J. (Augustine J.) -
- O'Reilly, Charles William -
- O'Reilly, Elizabeth Boyle 1874-
- O'Reilly, John Boyle 1844-1890
- O'Reilly, Joseph John Edward 1872-
- O'Rell, Max 1848-1903
- Oriani, Alfredo 1852-1909
- Origen 184-253
- Orléans, Charlotte-Elisabeth, duchesse d' 1652-1722
- Orléans, Henri d', Prince 1867-1901
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