Henrietta O'Neill (1758 – September 1793) was an Irish poet.
[1][4] Her father died in 1759 and her mother later married Thomas Brudenell-Bruce;[4] her younger half-siblings included Charles Brudenell-Bruce, 1st Marquess of Ailesbury.
[5] Henrietta O'Neill was a friend of the English novelist and poet Charlotte Smith.
Her best known poems are "Ode to the Poppy"[4] and "Written on Seeing her Two Sons at Play".
[9] Her husband outlived her, becoming a baron in 1793 and a viscount in 1795,[5] but was killed during the Irish Rebellion of 1798 at the age of 58.