Thomas Moore (28 May 1779 – 25 February 1852) was an Irish writer, poet, and lyricist, widely regarded in his lifetime as Ireland's "national bard". The acclaim rested primarily on the popularity of his Irish Melodies (with the first of ten volumes appearing in 1808). In these, Moore set to old Irish tunes verses that spoke to a nationalist narrative of Irish dispossession, loss, and resistance. With his romantic work Lalla Rookh (1817), in which these same themes are explored in an elaborate orientalist allegory, Moore achieved wider critical recognition. Translated into several languages, and adapted and arranged for musical performance by, among others, Robert Schumann, the chivalric verse-narrative established Moore as one of the leading exemplars of European romanticism.

In England, Moore moved in aristocratic Whig circles where, in addition to a salon performer, he was appreciated as a squib writer and master of political satire. Chief among his targets, in successive Tory governments, was Lord Castlereagh in whose promises of "emancipation" Moore believed his fellow Catholics in Ireland had been deceived. In the verse novel The Fudge Family in Paris (1818), and its sequels, he pillories the Foreign Secretary for employing the same "faithless craft" used to press Ireland into a union with Great Britain to accommodate restoration and reaction in Europe.

Wary in Ireland of an overtly Catholic place-seeking nationalism, Moore refused a nomination to stand with Daniel O'Connell and his Repeal Association for the Westminster parliament. His broader sympathies were expressed in his several prose works, including a biography of the United Irish leader Lord Edward Fitzgerald (1831) and the Memoirs of Captain Rock (1824). Complementing Maria Edgeworth's Castle Rackrent (1800), the satirical novel is the story, not of Anglo-Irish landowners, but of their exhausted tenants driven to the semi-insurrection of Whiteboyism.

Moore continues to be remembered chiefly for his Melodies (typically "The Minstrel Boy" and "The Last Rose of Summer"). He is also recalled, less generously, for the role he is thought to have played in the destruction of the memoirs of his friend, Lord Byron.