Thomas Smyth was born in Killeen, Clonbrock, Co Galway, Ireland around 1885.
He was the son of a farmer, Patrick Smyth (b. 1835) and he had two known siblings, Patrick (b. 1882) and Bridget (b. 1883). His mother, whose identity is unclear, had died prior to 1901. He grew up in a Roman Catholic household that spoke both Irish and English.
Thomas, his father and sister Bridget appeared on the 1901 census living at 4, Killeen, Clonbrock, Galway and Thomas, aged 16, was described as a farmer's son. His siblings Bridget and Patrick later emigrated to New York and Thomas remains the sole child at the home of his father on the 1911 census, now 4, Killeen, Clonbrock and he is still described as an unmarried farmer's son.
Thomas decided to join his siblings in New York and boarded the Titanic at Queenstown as a third class passenger (ticket number 384461, which cost him £7, 15s). He is believed to have shared a cabin with two other Galway men, Thomas Kilgannon and Martin Gallagher.
Thomas Smyth died in the sinking. His body, if recovered, was never identified. His estate, worth £25, was administered to his father Patrick on 28 March 1913.