Authors: O
- Ormerod, Eleanor A. (Eleanor Anne) 1828-1901
- Ormonde, John Butler, Marquis of 1808-1854
- Ormondroyd, Edward 1925-
- Ormsbee, J. -
- Ormsbee, Renee Richmond Huntley 1887-
- Ormsbee, Thomas H. (Thomas Hamilton) 1890-1969
- Ormsby, John 1829-1895
- Orndorff, Frank 1885-1971
- Orne, Martha Russell -
- Ornsby, Robert 1820-1889
- O'Rourke, John, Canon -
- Orpana, Topi 1886-1930
- Orpen, Adela E. (Adela Elizabeth Richards) 1855-1927
- Orpen, William, Sir 1878-1931
- Orr, Anne 1875-1946
- Orr, Charles Ebert 1861-1933
- Orr, John William 1815-1887
- Orr, Lucinda Lee -
- Orr, Lyndon -
- Orr, M. A. (Mary Acworth) 1867-1949
- Orr, Nathaniel -
- Orrock, James 1829-1913
- Orr, Sutherland, Mrs. 1828-1903
- Ortega Munilla, J. (José) 1856-1922
- Ortega Rubio, Juan 1845-1921
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