| O'Brian |
| Dave O'Brian |
| O'Brien |
| Hannah O'Brien (1880 - 1941) |
| Oldroyd |
| Agnes Mary Oldroyd (1872 - ) |
| Charles Henry Oldroyd (~1846 - 1884) |
| Oliver |
| Charles Oliver (~1781 - ) |
| Charles Oliver (~1815 - ) |
| Deborah Ann Oliver (~1818 - ) |
| Eli Oliver (~1845 - ) |
| Elizabeth Oliver (1774 - ) |
| George Oliver (1772 - ) |
| George Oliver (~1843 - ) |
| Henry Oliver (~1828 - ) |
| James Oliver (1770 - ) |
| James Oliver (1823 - ) |
| John Oliver (1738 - 1825) |
| John Oliver (~1762 - 1762) |
| John Oliver (~1880 - ) |
| Lucy Oliver (~1824 - ) |
| Mary Ann Oliver (~1847 - ) |
| Mary Ann Oliver (~1871 - ) |
| Mary Oliver (1763 - ) |
| Mary Oliver (~1827 - ) |
| Rebecca Oliver (1817 - 1899) |
| Thomas Oliver (1777 - ) |
| William Charles Oliver (~1875 - ) |
| William Oliver (1768 - ) |
| William Oliver (1839 - ) |
| William Oliver (~1847 - ) |
| Ongley |
| Doris Phoebe B Ongley (1902 - ) |
| Ernest George Ongley (1867 - ) |
| Florence Anne Ongley (1863 - ) |
| Freda Alice A Ongley (1906 - ) |
| Frederick Ernest Thomas Ongley (1897 - ) |
| Nellie Elizabeth F Ongley (1898 - ) |
| Thomas Ongley (~1835 - ) |
| Thomas Ongley (1894 - 1894) |
| Oram |
| Ann Oram |
| Elizabeth Oram |
| Hugh Oram |
| Hugh Oram |
| Hugh Oram (1695 - ) |
| Jacob Oram |
| John Oram (1650 - ) |
| Mary Oram (1744 - ) |
| Mildred M Oram |
| Sarah Oram |
| William Oram |
| Ordway |
| Sarah Ordway |
| Organ |
| Leslie Stephen Organ |
| Oxley |
| Margaret Charlotte Oxley (~1820 - ) |