Thomas Dunn was born in Liverpool, Lancashire in 1870, the son of James and Margaret Dunn. In 1911, he married Catherine Dunne, (née Conway), and they lived at 2, Aintree Street, Liverpool.
He was employed on the Lusitania as a fireman in the Engineering Department and he was killed when she was sunk.
His body was not amongst those recovered and identified afterwards and he is commemorated on the Mercantile Marine War Memorial at Tower Hill, London. He was aged 45 years.
The Liverpool and London War Risks Insurance Association Limited granted a yearly pension to Catherine Dunn to compensate her for the loss of her husband. This amounted to £23-6s-7d. (£23.33p.) which was payable at the rate of £1-15s-7d. (£1.78p.) per month.
His name is erroneously spelled Dunn in the records of the Commonwealth War Graves Commission and Board of Trade Records, as well as the records of The Liverpool and London War Risks Insurance Association Limited.
1871 Census of England and Wales, 1881 Census of England and Wales, 1891 Census of England and Wales, 1901 Census of England and Wales, Commonwealth War Graves Commission, Cunard Records, UniLiv. PR 13/24, PRO BT 334.