| Regimental number | 3160 |
| Religion | Church of England |
| Occupation | Butcher |
| Address | Killarney via Warwick, Queensland |
| Marital status | Single |
| Age at embarkation | 22 |
| Next of kin | Mother, Mrs Margaret Neill, Killarney via Warwick, Queensland |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 26th Battalion, 7th Reinforcement |
| AWM Embarkation Roll number | 23/43/2 |
| Embarkation details | Unit embarked from Brisbane, Queensland, on board HMAT A50 Itonus on |
| Rank from Nominal Roll | Lieutenant |
| Unit from Nominal Roll | 4th Division Artillery |
| Fate | Returned to Australia |
| Family/military connections | Brother: 3113 Sergeant Arthur Ernest O'NEILL MM, 11th Field Artillery Brigade, 30 January 1918. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |