| Surname | Initials | Rank | Army No. | ||
|---|---|---|---|---|---|
| O'Leary | E M P | Officer Cadet | 552640 | ||
| O'Loghlen | P | Sergeant | 901 | ||
| O'Looney | E | Private | 6843363 | ||
| O'Mahoney | W | Lance Corporal | 6409975 | ||
| O'Mahony | W | Private | 6409975 | ||
| O'Malley | J C | Lance Corporal | P/6995 | ||
| O'Malley | G | Lance Corporal | P/7210 | ||
| O'Malley | M | Lance Corporal | 399664 | ||
| O'Mara | D P | Lance Corporal | 25174629 | ||
| O'Neil | T | Sergeant | T/2379 |