O Authors
| Author Name | Description | Life | |
| Og Mandino |
American Author | 1923 - 1996 | |
| Ogden Nash | American Poet | 1902 - 1971 | |
| Oliver Wendell Holmes, Jr. |
American Jurist | 1841 - 1935 | |
| Oliver Wendell Holmes, Sr. | American Author and Poet | 1809 - 1894 |  |
| Omar Khayyam |
Persian Poet and Philosopher | 1048 - 1131 | |
| Orison Swett Marden | American Writer | 1850 - 1924 | |
| Oscar Wilde | Irish Writer, Poet and Playwright | 1854 - 1900 | |
| Otto von Bismarck | Prussian-German Statesman and Leader | 1815 - 1898 | |
| Ovid | Roman Poet | 43 BCE - 17 ACE |