| Place of birth | Caulfield, Victoria |
| Religion | Roman Catholic |
| Occupation | Barrister at law |
| Address | Sydney, New South Wales |
| Marital status | Single |
| Age at embarkation | 26 |
| Next of kin | Father, Mr Justice Gavan Duffy, High Court of Australia, Melbourne, Victoria |
| Enlistment date | |
| Rank on enlistment | 2nd Lieutenant |
| Unit name | 3rd Divisional Cyclist Company |
| AWM Embarkation Roll number | 12/6/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A64 Demosthenes on |
| Rank from Nominal Roll | 2nd Lieutenant |
| Unit from Nominal Roll | 20th Battalion |
| Fate | Killed in Action |
| Age at death from cemetery records | 27 |
| Place of burial | Quarry Cemetery (Plot III, Row D, Grave No. 9), Montauban, France |
| Panel number, Roll of Honour, Australian War Memorial | 91 |
| Miscellaneous information from cemetery records | Parents: Frank Gavan and Nellie Gavan DUFFY, Supreme Court, Melbourne, Victoria. Native of Elsternwick, Victoria |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
