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- O'boyle, Michael Joseph
- O'Dea, Yvonne
- O'hare, Kevin James
- O'sullivan, Patrick Joseph
- Oakes, Austin Roy
- Oakes, Robert Frederick
- Oates, Ty Jonathan
- Ogilvie, Alan Christopher
- Oldham, Doreen May
- Olive, Patrick Michael Joseph
- Oliver, Philip
- Olliver, Christine Jane
- Oloo, Paul Perry Okoth
- Osborn, Christopher Aubrey
- Osborn, Radley Matthew
- Osborn-peters, Antonia Johanna Maria
- Osborne, Doris Rose
- Overton, Jennifer Clare
- Owens, Ann Bridget
- Oxby, Dorothy Lilian Eileen