| Other Names | O'REGAN, Cornelius~ |
| Religion | Roman Catholic |
| Occupation | Priest |
| Address | R C Presbytery, Singleton, New South Wales |
| Marital status | Single |
| Age at embarkation | 37 |
| Next of kin | Brother, Rev P O'Brien, The Presbytery, Kramback, New South Wales |
| Enlistment date | 28 September 1916 |
| Rank on enlistment | Chaplain (4th Class) |
| Unit name | Chaplains' Corps |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A63 Karoola on 19 August 1916 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A26 Armadale on 19 July 1916 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A11 Ascanius on 25 October 1916 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A11 Ascanius on 27 May 1916 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A73 Commonwealth on 19 September 1916 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A29 Suevic on 11 November 1916 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A14 Euripides on 11 September 1916 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A35 Berrima on 22 December 1914 |
| Rank from Nominal Roll | Chaplain (Class 4) |
| Unit from Nominal Roll | RC |
| Fate | Appointment terminated 5 July 1917 |
