| Religion | Roman Catholic |
| Occupation | Barister |
| Address | Cliveden Mansions, East Melbourne, Victoria |
| Marital status | Single |
| Age at embarkation | 32 |
| Next of kin | Father, Justice Gavin Duffy, High Court of Australia |
| Enlistment date | 1 May 1915 |
| Date of enlistment from Nominal Roll | 20 March 1917 |
| Rank on enlistment | Lieutenant |
| Unit name | Field Artillery Brigade 1, Reinforcement 6 |
| AWM Embarkation Roll number | 13/29/2 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A35 Berrima on 26 June 1915 |
| Rank from Nominal Roll | Driver |
| Unit from Nominal Roll | 2nd Motor Transport Company |
| Fate | Returned to Australia 8 September 1919 |
| Miscellaneous details (Nominal Roll) | *Stated to be Charles Gavan Duffy on NR |
