| SURNAME | GIVEN Names | Birth Year | Birth.Place | Father | Mother |
| O' NEIL | Patrick | 1895? | |||
| OATES | Edith | 1878? | Penshaw, Houghton le Spring | Isaac | Mary Hannah |
| OATES | Frederick | 1876 | Penshaw, Houghton le Spring | Isaac | Mary Hannah |
| OATES | Henry | 1880? | Penshaw, Houghton le Spring | Isaac | Mary Hannah |
| OATES | Isaac | 1852? | Penshaw, Houghton le Spring | ||
| OATES | James | 1825? | |||
| OATES | Joshua | 1890? | |||
| OATES | Leonard | 1852? | James | Sarah | |
| OATES | Mary | 1850? | James | Sarah | |
| OATES | Mary Hannah | 1855? | Penshaw, Houghton le Spring | ||
| O'BRIEN | Marybelle | 1887? | |||
| O'CONNELL | Mary Helena Agnes | 1885 | South Yarra, Melbourne | ||
| O'CONNOR | Cornelius | 1884 | Chester le Street | ||
| OCTON | Robert | 1898? | |||
| ODOM | James Henry | 1842? | |||
| ODOM | R L | 1841? | |||
| OGDEN | George | 1856? | |||
| OGG | Jane | 1792? | |||
| OGG | William | 1790? | |||
| OGLAY | Wilyem | 1551? | |||
| OGLE | Elizabeth | 1787? | |||
| OLD | Thomas | 1730? | |||
| OLDFIELD | Agnes Ida | 1884 | |||
| OLEFOR | Ann | 1677? | |||
| OLIPHANT | Unknown | 1750? | |||
| OLIVER | Ivy | 1900? | |||
| OLIVER | Jane | 1669? | |||
| OLLEY | Alexandra | 1864? | Stepney, LND | ||
| OLLEY | Margaret May | 1878? | Poplar, LND | William Frederick | Margaret Sarah |
| OLLEY | Susan Bessie | 1879 | Poplar, LND | William Frederick | Margaret Sarah |
| OLLEY | William Frederick | 1853? | Bethnal Green, LND | ||
| OLLIVER | Elizabeth | 1660? | Ordsall, East Retford | ||
| ONCLEY | Helen Esther | 1899 | |||
| ORANGE | Ann | 1782? | |||
| ORANGE | Bella Foggan | 1888 | Benfieldside, Lanchester | Joseph | Elizabeth |
| ORANGE | Joseph | 1847 | Benfieldside, Lanchester | ||
| ORD | Edward | 1831? | |||
| ORD | Isabella | 1884? | |||
| ORD | Jane | 1868 | Newcastle upon Tyne | Edward | Mary |
| ORD | Robert | 1896? | |||
| ORD | Robert | 1745? | |||
| ORKNIE | John | 1741? | |||
| ORMISTON | Mary | 1790? | |||
| ORMSTON | John | 1853? | Kelso, ROX | ||
| ORMSTON | Margaret | 1848? | Kelso, ROX | ||
| ORMSTON | Norman | 1896 | |||
| ORMSTON | William | 1843? | Kelso, ROX | ||
| ORR | Mr | 1881? | |||
| ORRICK | George | 1857? | Walker, Tynemouth | ||
| ORRICK | Thomas | 1880? | Walker, Tynemouth | George | Jane Ann |
| ORRISS | Robert | 1856? | |||
| O'SULLIVAN | Daniel | 1870? | John | Martha | |
| O'SULLIVAN | John | 1850? | Cork, County Cork | ||
| O'SULLIVAN | Julia | 1870? | John | Martha | |
| O'SULLIVAN | Martha | 1877? | John | Martha | |
| O'SULLIVAN | Martha | 1859? | Ratcliff, Stepney | ||
| O'SULLIVAN | Mary | 1874? | Limehouse, Stepney | John | Martha |
| O'SULLIVAN | William | 1873? | Limehouse, Stepney | John | Martha |
| OTTERBURN | Eleanor | 1823? | |||
| OTTO | Margaret Crichton | 1842? | |||
| OUTERSON | Betty | 1702? | |||
| OUTERSON | John | 1748? | |||
| OVEREND | Sarah | 1820? | Ludlow, SAL | ||
| OVINGTON | Elizabeth | 1822? | Henry | Mary | |
| OVINGTON | Jane | 1836? | Henry | Mary | |
| OVINGTON | John | 1725? | |||
| OVINGTON | Margaret | 1831? | Henry | Mary | |
| OVINGTON | Mary | 1824? | Henry | Mary | |
| OVINGTON | Mary | 1792? | |||
| OVINGTON | Thomas | 1828? | Henry | Mary | |
| OVINGTON | William | 1834? | Henry | Mary | |
| OWENS | Alice Jane | 1883 | Hartlepool | James | Mary |
| OWENS | Elizabeth | 1863? | South Hetton, Easington | ||
| OWENS | James | 1853? | |||
| OWENS | Thomas | 1882? | |||
| OWERS | Mary | 1859? | Pelton, Chester Le Street | ||
| OWINETT | Unknown | 1892? | |||
| OXBERRY | Ethel | 1895? |