| O. Douglas 1823 South Carolina Unknown, Martha A. |
| O. R. Douglas 1891 Tennessee Brassfield, Fannie |
| O. W. Douglas 22 Feb 1847 26 Oct 1922 |
| Obe Douglas 17 Jun 1881 |
| Octavia Douglas 1840 Tennessee |
| Octavius Douglas 1893 North Carolina |
| Odel Douglas 25 Mar 1915 Allen County, Kentucky |
| Odie Bell Douglas 02 Sep 1897 28 Dec 1897 Rutherford, Tennessee |
| Okla Douglas 1911 1955 Tennessee Miller, James |
| Ola Douglas 1880 |
| Ola Douglas 22 May 1903 Elk Valley, Campbell, Tennessee Disney, Leland Morton |
| Olive Douglas 04 Nov 1731 14 Oct 1749 Plainfield, Windham, Connecticut |
| Olive Douglas 1745 26 Jan 1820 Cornwall, Litchfield, Connecticut |
| Olive Douglas 07 Sep 1748 Canaan, Litchfield, Connecticut |
| Olive Douglas 14 Oct 1749 20 Oct 1805 Plainfield, Windham, Connecticut |
| Olive Douglas 28 Feb 1758 12 Oct 1830 Plainfield, Windham, Connecticut Bradford, Anthony B |
| Olive Douglas 25 Mar 1768 24 Jul 1828 Fowler, Samuel |
| Olive Douglas 04 Apr 1768 14 Aug 1847 Canaan, Columbia, New York Warner, Daniel |
| Olive Douglas 04 Dec 1775 25 Nov 1799 Parke, Douglas |
| Olive Douglas 11 Nov 1809 05 May 1856 Waterford, New London, Connecticut Peck, David |
| Olive Douglas 1830 Maine |
| Olive Douglas 1831 Maine |
| Olive Douglas 1905 2000 Kentucky |
| Olive Anne Douglas Abt. 1915 |
| Olive B. Douglas 1913 Kentucky |
| Olive Campbell Douglas 14 Apr 1808 |
| Olive Elnora Douglas 20 May 1888 Waucoma, Fayette, Iowa Phenneger, Forrest G |
| Olive J Douglas 1848 York District, York, South Carolina |
| Oliver Douglas Abt. 1771 |
| Oliver Douglas 08 May 1783 20 Nov 1784 Stephentown, Rensselaer, New York |
| Oliver Douglas 1849 Wisconsin |
| Oliver Douglas Abt. 1853 |
| Oliver Douglas 27 May 1884 Sep 1964 Kentucky Unknown, Laura |
| Oliver Pratt Douglas 05 Apr 1811 New London, New London, Lyme, Connecticut Gordon, Eliza |
| Oliver Wolcott Douglas 1821 Waterford, New London, Connecticut Beebe, Elizabeth |
| Olivia Douglas 1849 Pennsylvania |
| Olivia Douglas 1907 Alabama |
| Olivia Douglas 1911 Kentucky |
| Ollie Douglas 1892 1922 |
| Ollie Douglas 1893 Tennessee Unknown, Virgie L. |
| Ollie Douglas 1908 Kentucky |
| Ollie Douglas. Born 10 December 1926. Died 19 January 1993 |
| Ollie E. Douglas Oct 1887 Tennessee |
| Ollie G. Douglas 1912 Kentucky |
| Ollie May Douglas 02 May 1884 23 Nov 1982 Lower Salem, Massac, Illinois Wood, William Otis |
| Olney Viola Douglas 17 Dec 1876 24 Dec 1951 Brock, Nemaha, Nebraska Barton, Charles |
| Ona Omega Douglas 19 Jun 1890 18 May 1946 |
| Onovine Douglas 1842 Louisiana |
| Opal O. Douglas 1906 Kentucky |
| Ora Douglas 1903 |
| Ora Butler Douglas 26 Sep 1837 28 Jul 1863 Gorham, Ontario, New York |
| Ora Butler Douglas 25 Jun 1847 Avon, Livingston, New York McGrath, Mary V |
| Ora Lee Douglas 13 Oct 1906 16 Mar 1986 Metcalfe, Kentucky |
| Ora M. Douglas 1916 Tennessee |
| Orah Douglas 1895 Kentucky |
| Orell Douglas 1875 Kansas |
| Orie A Douglas 1898 Alabama Unknown, Myrtle |
| Orilla Douglas Abt. 1809 Vermont Atwood, Unknown |
| Orland H Douglas 02 Mar 1886 03 May 1933 Waddell, Beulah |
| Orlando Benajah Douglas 12 Sep 1836 Cornwall, Addison, Vermont Rust, Mary Ann |
| Orpha Artie Douglas 11 Oct 1892 16 Jun 1921 Campbell County, Tennessee Douglas, Spencer |
| Orpha R Douglas 1840 New York |
| Orphici Douglas 08 Mar 1874 02 Apr 1879 |
| Orval Sylvester Douglas 16 Mar 1916 20 Jul 1995 |
| Orvilla S Douglas 24 Sep 1853 24 Apr 1947 Covington, Tioga, Pennsylvania |
| Orville E. Douglas 1915 Kentucky |
| Orville E. Douglas 1915 Kentucky |
| Osborn Douglas 1885 Tennessee |
| Oscar Douglas Abt. 1817 |
| Oscar Douglas 1850 Maine |
| Oscar Douglas 05 Feb 1880 Jan 1967 Johnson County, Nebraska Dew, Jennie Maud |
| Oscar Douglas 06 Aug 1913 17 Oct 1969 Campbell, Tennessee Douglas, Mary R |
| Oscar Lee Douglas 16 Aug 1892 20 Jul 1978 Bucyrus, Texas, Missouri Hoeck, Lottie Amelia |
| Oscar Toluthian Douglas 07 Apr 1881 |
| Otis Douglas Nov 1899 Tennessee |
| Otis Douglas 1905 Kentucky |
| Otis B Douglas Oct 1887 Rigney, Lucy |
| Otto Clinton Douglas 22 Dec 1881 16 Dec 1968 Lower Salem, Massac, Illinois Smith, Ella Mae |
| Oustill V Douglas 31 May 1889 18 Sep 1891 |
| Ozander Douglass 1840 New York |
| Ozelma T. Douglas 1909 Kentucky |