| Regimental number | 2220 |
| Place of birth | Callington South Australia |
| Religion | Roman Catholic |
| Occupation | Miner |
| Address | Callington, South Australia |
| Marital status | Single |
| Age at embarkation | 30 |
| Next of kin | Mother, Mrs Elizabeth O'Neill, Callington, South Australia |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 48th Battalion, 4th Reinforcement |
| AWM Embarkation Roll number | 23/65/3 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A70 Ballarat on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 48th Battalion |
| Recommendations (Medals and Awards) |
Military Medal Recommendation date: Bar to Military Medal Recommendation date: |
| Fate | Died of wounds |
| Age at death from cemetery records | 32 |
| Place of burial | Etaples Military Cemetery (Plot XXXIII, Row F, Grave No. 30), France |
| Panel number, Roll of Honour, Australian War Memorial | 146 |
| Miscellaneous information from cemetery records | Parents: Patrick and Elizabeth O'NEILL, Murray Bridge, South Australia. Native of Callington, New South Wales |
| Medals |
Military Medal Source: 'Commonwealth Gazette' No. 219 Date: MM Bar Source: 'Commonwealth Gazette' No. 185 Date: |
| Family/military connections | Brother: 2237 Pte Henry Patrick O'NEILL, 59th Bn, killed in action, 8 August 1918. |
| Other details |
War service: Western Front Medals: Military Medal & Bar, British War Medal, Victory Medal |