| Oneill | J P | | | Source: QSA and KSA rolls |
| Oneill | T | | | Source: QSA and KSA rolls |
| Oram | G H | | | Source: QSA and KSA rolls |
| Oram | George Henry | 1006 | Private | Source: Nominal roll in WO127 |
| Oram | P H | | | Source: QSA and KSA rolls |
| Orchard | C | | | Source: QSA and KSA rolls |
| Orchard | Charles Henry | 182 | Private | Source: Nominal roll in WO127 |
| Ord | H | | | Source: QSA and KSA rolls |
| Ord | Ralph Henry | 1013 | Private | Source: Nominal roll in WO127 |
| Orman | J | | | Source: QSA and KSA rolls |
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