| Name | Dates | Generation | Go to family tree |
|---|---|---|---|
| O'BRIEN, David | ????-???? | 1 | Family Tree |
| OGDEN, Catherine ** | ????-???? | 7 | Family Tree |
| OGILVIE, Katherine ** | ????-???? | 7 | |
| OGILVIE, Margaret | ????-???? | 9 | Family Tree |
| OLDFIELD, Col. Christopher | ????-???? | 3 | Family Tree |
| OLDFIELD, Dorothy | ????-???? | 2 | Family Tree |
| OLDFIELD, Elizabeth | ????-???? | 1 | Family Tree |
| OLDFIELD, Guy | ????-???? | 2 | Family Tree |
| OLDFIELD, John | ????-???? | 2 | Family Tree |
| OLDFIELD, Maj. H | ????-???? | 3 | Family Tree |
| OLDFIELD, Maud | ????-???? | 3 | Family Tree |
| OLDFIELD, Sir Richard | ????-???? | 4 | Family Tree |
| ORD, Margaret | 1744-1781 | 5 | Family Tree |
| OSBORN, Amy Elizabeth | 1859-1923 | 2 | Family Tree |