| Regimental number | 764 |
| Religion | Roman Catholic |
| Occupation | Shearer |
| Address | Geddes Street, Warialda, New South Wales |
| Marital status | Single |
| Age at embarkation | 29 |
| Next of kin | Mother, Mrs Mary Ann O'Neill, Geddes Street, Warialda, New South Wales |
| Enlistment date | |
| Rank on enlistment | Sapper |
| Unit name | No 1 Mining Corps |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A38 Ulysses on |
| Rank from Nominal Roll | Sapper |
| Unit from Nominal Roll | Tunnelling Companies Details |
| Fate | Died of disease |
| Age at death from cemetery records | 32 |
| Place of burial | Ste Marie Cemetery (Plot III, Row C, Grave No. 5), Le Havre, France |
| Panel number, Roll of Honour, Australian War Memorial | 27 |
| Miscellaneous information from cemetery records | Parents: William and Mary O'NEILL, Warialda, New South Wales |
| Family/military connections | Brother: 1892 Pte Henry Thomas O'NEILL, 33rd Bn, killed in action, 7 June 1917. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |