Authors on O
- O'Brien, Edward J. (Edward Joseph Harrington), 1890-1941 (1 books)
- O'Brien, Fitz James, 1828-1862 (1 books)
- O'Brien, Frederick, 1869-1932 (2 books)
- O'Brien, George (1 books)
- O'Brien, Howard Vincent, 1888-1947 (1 books)
- O'Brien, Jack (1 books)
- O'Brien, James (1 books)
- O'Brien, Joseph (2 books)
- O'Brien, Seumas (2 books)
- O'Conner, T. P. (1 books)
- O'Connor, John Lawrence (1 books)
- O'Connor, William Douglas, 1832-1889 (1 books)
- O'Cotter, Pat (1 books)
- O'Donnell, Elliott, 1872-1965 (6 books)
- O'Grady, Standish, 1846-1928 (1 books)
- O'Hagan, Thomas (1 books)
- O'Hara, Thomas J. (1 books)
- O'Hegarty, P. S. (1 books)
- O'Higgins, Harvey Jerrold, 1876-1929 (1 books)
- O'Keefe, John (1 books)
- O'Keeffe, John (1 books)
- O'Kelly, Seumas, 1881-1918 (1 books)
- O'Mahony, Charles (1 books)
- O'Mahony, John, 1816-1877 (1 books)
- O'Meara, James, 1825-1903 (1 books)
- O'Neill, Elizabeth (Elizabeth Speakman), 1877- (1 books)
- O'Neill, Eugene, 1888-1953 (4 books)
- O'Reilly, A. J. (Augustine J.) (1 books)
- O'Rell, Max, 1848-1903 (5 books)
- O'Rourke, John (1 books)
- O'Shea, John Augustus (2 books)
- Oakey, Daniel (2 books)
- Oates, W. Coape (1 books)
- Obama, Barack, 1961- (1 books)
- Ober, Frederick Albion, 1849-1913 (3 books)
- Obrien, Francis P. (1 books)
- Ockside, Knight Russ (1 books)
- Octavo, Anno (1 books)
- Oehlenschläger, Adam Gottlob, 1779-1850 (1 books)
- Oemler, Marie Conway, 1879-1932 (3 books)
- Ogden, George W. (George Washington), 1871-1966 (6 books)
- Ogden, Henry N. (Henry Neely), 1868- (1 books)
- Ogden, Ruth, 1853-1927 (1 books)
- Ogg, Frederic Austin, 1878-1951 (3 books)
- Ogilvie, David Douglas (1 books)
- Ogilvie, John, 1732-1813 (1 books)
- Ogilvy, Maud (1 books)
- Ohnet, Georges, 1848-1918 (3 books)
- Okakura, Kakuzo, 1862-1913 (1 books)
- Okakura, Yoshisaburo (1 books)
- Okey, Thomas, 1852-1935 (1 books)
- Olcott, Charles S. (1 books)
- Olcott, Frances Jenkins, 1872-1963 (1 books)
- Olcott, Henry Steel, 1832-1907 (2 books)
- Olcott, William Tyler, 1873-1936 (1 books)
- Old Humphrey, 1787-1854 (1 books)
- Oldmixon, John (1 books)
- Oldmixon, Mr. (John), 1673-1742 (1 books)
- Oldroyd, Osborn H. (Osborn Hamiline), 1842-1930 (1 books)
- Olin, Richard (1 books)
- Oliphant, Laurence, 1829-1888 (3 books)
- Oliphant, Mrs. (Margaret), 1828-1897 (16 books)
- Oliver, Stephen, 1950- (2 books)
- Ollivant, Alfred, 1874-1927 (2 books)
- Olney, Warren, 1841-1921 (1 books)
- Oman, Charles William Chadwick (1 books)
- Omar Khayyám, 1048-1122 (2 books)
- Omond, George W. T. (George William Thomson), 1846-1929 (2 books)
- Onions, Oliver [pseud.], 1873-1961 (6 books)
- Ontario. Ministry of Education (9 books)
- Opie, Amelia Alderson (1 books)
- Opie, Amelia Alderson, 1769-1853 (1 books)
- Oppenheim, E. Phillips (Edward Phillips), 1866-1946 (47 books)
- Oppenheim, James, 1882-1932 (1 books)
- Oppenheim, L. (Lassa), 1858-1919 (4 books)
- Optic, Oliver, 1822-1897 (47 books)
- Orchard, Thomas Nathaniel (1 books)
- Orcutt, William Dana, 1870-1953 (3 books)
- Orczy, Baroness Emmuska, 1865-1947 (2 books)
- Orczy, Emmuska Orczy, Baroness, 1865-1947 (13 books)
- Ordway, Edith B. (2 books)
- Orleans, Charlotte-Elisabeth, duchesse d', 1652-1722 (6 books)
- Ormondroyd, Edward, 1925- (1 books)
- Ormsbee, Thomas H. (Thomas Hamilton), 1890-1969 (1 books)
- Orpen, Mrs Goddard (1 books)
- Orpen, William, Sir, 1878-1931 (1 books)
- Orr, Charles Ebert, 1861-1933 (2 books)
- Orr, Lucinda Lee (2 books)
- Orr, Lyndon (5 books)
- Orr, Sutherland, Mrs., 1828-1903 (1 books)
- Orth, Samuel P. (1 books)
- Orth, Samuel Peter, 1873-1922 (3 books)
- Orton, Arthur W. (1 books)
- Orton, George W., 1873-1958 (1 books)
- Orton, Helen Fuller, 1872-1955 (2 books)
- Orton, James, 1830-1877 (1 books)
- Orzeszkowa, Eliza, 1842-1910 (2 books)
- Osborn, Sherard, 1822-1875 (1 books)
- Osborne, Carolyn M. (1 books)
- Osborne, Dorothy, 1627-1695 (1 books)