All Authors
| Author | Born on | Died |
|---|---|---|
| Orlando Bloom | January 13, 1977 | - |
| Orlando Brown | December 4, 1987 | - |
| Orlando Cepeda | September 17, 1937 | - |
| Orlando Gibbons | December 25, 1583 | June 5, 1625 |
| Orlando Jones | April 10, 1968 | - |
| Ornella Muti | March 9, 1955 | - |
| Ornette Coleman | March 19, 1930 | June 11, 2015 |
| Orrin Hatch | March 22, 1934 | - |
| Orson F. Whitney | July 1, 1855 | May 16, 1931 |
| Orson Pratt | September 19, 1811 | October 3, 1881 |
| Orson Scott Card | August 24, 1951 | - |
| Orson Welles | May 6, 1915 | October 10, 1985 |
| Orville Redenbacher | July 16, 1907 | September 20, 1995 |
| Orville Wright | August 19, 1871 | 1948 |
| Os Guinness | September 30, 1941 | - |
| Oscar De La Hoya | February 4, 1973 | - |
| Oscar de la Renta | July 22, 1932 | October 20, 2014 |
| Oscar Fernandes | March 27, 1941 | - |
| Oscar Hammerstein | July 12, 1895 | August 23, 1960 |
| Oscar Hammerstein II | July 12, 1895 | August 23, 1960 |