Thomas Osborne Davis (October 14, 1814 - September 16, 1845) was an Irish writer and politician who was the chief organizer and poet of the Young Ireland movement.
Thomas Davis was born in the town of Mallow in the county of Cork. He studied in Trinity College, Dublin, and received an Arts degree, precursory to his being called to the Irish Bar in 1838. He established The Nation newspaper with Charles Gavan Duffy and John Blake Dillon. He dedicated his life to Irish nationalism.
He wrote some stirring nationalistic ballads, originally contributed to The Nation, and afterwards republished as Spirit of the Nation, as well as a memoir of Curran, the Irish lawyer and orator, prefixed to an edition of his speeches; and he had formed many literary plans which were brought to nought by his death, from tuberculosis, in 1845 at the age of 30.