- Old
- Oldcorn
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Kathleen Annie (1901 - 1977)
- Oliff
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John (1777 - 1846)Susan (1809 - )
- Oliver
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Laura B (1880 - )Mary (1865 - b 1895)Reginald W (1879 - )Thomas (1880 - )William B (1850 - )
- Oller
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Corinne Elizabeth (1904 - 1980)
- Olson
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Gretchen Elaine (1935 - 2016)
- Oneill
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Kenneth Henry (1929 - )
- Ongley
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Albert (1863 - 1951)Binie Elizabeth (1889 - 1961)Henry (1822 - 1923)
- Oram
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Joanna (1748 - 1826)Robert (1697 - 1782)Robert (1736 - )
- Orbell
- Orchard
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Fanny (1862 - )Richard Summers (1849 - 1876)
- Organ
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Pamela Joyce (1937 - 1991)
- Ormiston
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Violet Patricia (1932 - 2012)
- Ormond
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Elizabeth (1745 - 1829)
- Ortiz Rubio
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Maria del Refugio (1907 - 1978)
- Orton
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Annie E (1891 - 1998)Arthur Mark (1910 - 1984)John Edward (1865 - 1941)John Edward Jr. (1897 - 1953)Joyce Nannie (1925 - 1990)Mabel M (1902 - 1956)
- Osborn
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Dennis Albert (1926 - 2012)Rose Hannah (1805 - 1855)
- Osborne
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George Alfred (1928 - 1976)Jane (1861 - )John W (1888 - 1941)Joseph Charles Cecil (1899 - 1976)Marie Jean (1915 - 1986)Vivian de Orellana (1880 - 1963)
- Osbourne
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Albert Edward (1909 - )Albert Edward (1932 - 1994)Alfred George T (1908 - )Beverley Margaret (1951 - 1996)Dorothy (1900 - 1988)Edith May (1900 - 1901)Frederick Thomas (1902 - 1950)Frederick Thomas (1924 - 1980)George Henry (1942 - 1995)Jesse John C (1897 - 1959)Jesse John Cecil (1874 - )Leonard Gough (1885 - 1917)Lewis James (1898 - 1903)