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- Toni O'BRIEN (?)
- Maria O'CONNOR (1806 – 1867)
- Benedict OATEN (1978 – ?)
- Daniel OATEN (1983 – ?)
- Gabrielle OATEN (1976 – ?)
- Louise OATEN (1980 – ?)
- Paul OATEN (1944 – 1998)
- William OATES (?)
- Herbert Francis E ODELL (?)
- Eileen Leslie OGILVY (1879 – 1955)
- Donald OLIVER (?)
- Dorothy OLIVER (?)
- Emma Rose OLIVER (2005 – ?)
- Falcon Charles OLIVER (1971 – ?)
- Harriet Louise OLIVER (2008 – ?)
- Kim OLIVER (1970 – ?)
- Louise Anne OLIVER (1965 – ?)
- Philadelphia Jo OLIVER (1972 – ?)
- Rupert OLIVER (1941 – ?)
- Sybille OLIVIER (1901 – 1989)
- Cdr John Kendal Somerville ORAM RN (?)
- Miranda Juliet ORAM (1962 – ?)
- Maj A S ORPEN OBE (?)
- Anne Margaret ORPEN (1924 – ?)
- Louise Elizabeth Mary ORPEN (1923 – ?)
- Emma Elizabeth Sutherland ORR (?)
- Inez Gilmour ORR (?)
- Carola (Carole) Mirabel ORR-SIMPSON (?)
- Charles Robert ORR-SIMPSON (?)
- Patrick Robert Cobbold ORR-SIMPSON (?)
- Shirley Elizabeth ORR-SIMPSON (?)
- Ashley Victoria ORSER (1985 – ?)
- David Creighton ORSER (1953 – ?)
- Emily Roberta ORSER (1989 – ?)
- Josephine Boris-Garcia OSORIO (?)
- Lara Katherine OSWALD (1999 – ?)
- Lucy OSWALD (1997 – ?)
- Marina OSWALD (1996 – ?)
- William Alexander Michael OSWALD (?)
- Brig. Gen. Charles Cunliffe OWEN CB RA (1863 – 1932)
- Brig. Christopher (Kit) Charles Lynwood Owen OWEN MVO OBE (1941 – 2007)
- Darcey Rose Kitty OWEN (2009 – ?)
- Denis Owen OWEN (?)
- Florence Lily OWEN (2007 – ?)
- George Christopher Owen OWEN (1981 – ?)
- Harry Victor Owen OWEN (?)
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