Authors: w
- O'Connor, William Douglas 1832-1889
- O'Connor, William Frederick Travers, Sir 1870-1943
- Odell, Samuel W. 1864-1948
- Odum, Howard Washington 1884-1954
- Oesterley, W. O. E. (William Oscar Emil) 1866-1950
- Ogden, George W. (George Washington) 1871-1966
- Ogden, Ruth 1853-1927
- Ogilvie-Grant, W. R. (William Robert) 1863-1924
- Ogilvie, William 1688-1729
- Oland, Warner 1880-1938
- Olcott, William Tyler 1873-1936
- Oldfather, W. A. (William Abbott) 1880-1945
- Oliphant, Mrs. (Margaret) 1828-1897
- Oliver, F. W. (Francis Wall) 1864-1951
- Olmsted, Everett Ward 1869-
- Olney, Warren 1841-1921
- Olson, Ernst W. (Ernst Wilhelm) 1870-1958
- Oman, Charles 1860-1946
- Omond, George W. T. (George William Thomson) 1846-1929
- Oncken, Wilhelm 1838-1905
- O'Neill, Rose Cecil 1874-1944
- Onkel Adam 1804-1889
- Optic, Oliver 1822-1897
- Orchard, W. E. (William Edwin) 1877-1955
- Orcutt, William Dana 1870-1953
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