| Regimental number | 1723 |
| Place of birth | Gundara, Coolah, New South Wales |
| Religion | Roman Catholic |
| Occupation | Saddler |
| Address | Dunedoo, New South Wales |
| Marital status | Married |
| Age at embarkation | 21 |
| Height | 5' 5.5" |
| Weight | 130 lbs |
| Next of kin | Wife, Mrs Agnes Eleesia Regan, Dunedoo, New South Wales |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Lithgow, New South Wales |
| Rank on enlistment | Private |
| Unit name | 53rd Battalion, 2nd Reinforcement |
| AWM Embarkation Roll number | 23/70/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A40 Ceramic on |
| Rank from Nominal Roll | Driver |
| Unit from Nominal Roll | 53rd Battalion |
| Fate | Died of wounds |
| Age at death from cemetery records | 22 |
| Place of burial | Villers-Bretonneux Communal Cemetery (Row B, Grave No. 4), France |
| Panel number, Roll of Honour, Australian War Memorial | 158 |
| Miscellaneous information from cemetery records | Parents: Thomas and Sarah REGAN; husband of Mrs A. SUTHERLAND (formerly REGAN), Coolah, New South Wales |
| Other details |
War service: Egypt, Western Front Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, REGAN William Ernest |