| Full Name | O'BYRNE Thomas |
| Service Number | 254 |
| Date Enlisted | 30/December/1914 |
| Age | 27 |
| Occupation | Labourer |
| Battle | SS "Southland" sunk by enemy action nr Lemnos |
| Initial Unit | 21st Battalion |
| Last Unit | 21st Battalion |
| Final Rank | Private |
| Date of Death | 02-September-1915 |
| Country | Turkey |
| Cause of Death | Drowned |
| Place of Burial | Helles Memorial |
| Citations | |
| Notes | |
| Other Notes | |
| Graveyard Image | 4812 |