| O'Rielly | A | | | Source: QSA and KSA medal rolls |
| O'Rielly | R E | | | Source: QSA and KSA medal rolls |
| Obrien | P | | | Source: QSA and KSA medal rolls |
| Odonoghue | W | | | Source: QSA and KSA medal rolls |
| Olen | A J | | | Source: QSA and KSA medal rolls |
| Olen | D J | | | Source: QSA and KSA medal rolls |
| Oliver | J H | | | Source: QSA and KSA medal rolls |
| Oman | W | | | Source: QSA and KSA medal rolls |
| Ordemann | C F | | | Source: QSA and KSA medal rolls |
| Organ | W | | | Source: QSA and KSA medal rolls |
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