| Regimental number | 163 |
| Place of birth | Victoria |
| School | Woolshed Flat State School, Victoria |
| Religion | Roman Catholic |
| Occupation | Shearer |
| Marital status | Single |
| Age at embarkation | 23 |
| Next of kin | Father, D. O'Brien, Korong Vale, Victoria |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 6th Light Horse Regiment, A Squadron |
| AWM Embarkation Roll number | 10/11/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board Transport A29 Suevic on |
| Rank from Nominal Roll | Lance Corporal |
| Unit from Nominal Roll | 1st Field Squadron Engineers |
| Fate | Died of disease |
| Place of death or wounding | Ludd, Palestine |
| Age at death | 27.11 |
| Age at death from cemetery records | 27 |
| Place of burial | Ramleh War Cemetery (Row DD, Grave No. 53), Palestine |
| Panel number, Roll of Honour, Australian War Memorial | 25 |
| Miscellaneous information from cemetery records | Parents: David and Catherine O'BRIEN, Korong Vale, Victoria |
| Family/military connections | Brothers: 2367 Pte Ronald Ewan O'BRIEN, 8th Bn, killed in action, 20 September 1917; 655A Pte David Michael O'BRIEN, 39th Bn, returned to Australia, 5 April 1919. |
| Other details |
Medals: 1914-15 Star, British War Medal, Victory Medal |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
