| Regimental number | 208 |
| Place of birth | Narrabri, New South Wales |
| Religion | Roman Catholic |
| Occupation | Blacksmith |
| Address | Narrabri West, New South Wales |
| Marital status | Single |
| Age at embarkation | 20 |
| Height | 6' 4" |
| Weight | 180 lbs |
| Next of kin | E. O'Brien, Narrabri West, New South Wales |
| Previous military service | Citizen Forces |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Place of enlistment | Randwick. New South Wales |
| Rank on enlistment | Private |
| Unit name | 2nd Battalion, B Company |
| AWM Embarkation Roll number | 23/19/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A23 Suffolk on |
| Rank from Nominal Roll | Lance Corporal |
| Unit from Nominal Roll | 2nd Battalion |
| Fate | Returned to Australia |
| Miscellaneous information from cemetery records | Parents: Thomas and Jane O'BRIEN |
| Discharge date | |
| Other details |
War service: Egypt, Gallipoli Embarked Alexandria to join the Mediterranean Expeditionary Force, 5 April 1915. Promoted Lance Corporal, Lemnos, 8 April 1915. Wounded in action, Gallipoli, 25 April 1915 (gunshot wound, right arm and left foot); admitted to No 17 General Hospital, Alexandria, 1 May 1915; transferred to No 15 General Hospital, 30 May 1915; to No 1 Australian General Hospital, Cairo, 27 July 1915; transferred to Convalescent Camp, Helouan, 29 July 1915. Commenced return to Australia from Suez on board HT 'Themistocles', 15 August 1915; disembarked, 9 September 1915; discharged Sydney (medically unfit: battle wound leg and arm), 8 January 1916. Medals: 1914-15 Star, British War Medal, Victory Medal Death attributed to war service. |
| Date of death | |
| Age at death | 40 |
| Place of burial | Gladstone Cemetery, Queensland |
| Sources | NAA: B2455, O'BRIEN John Wilfred |