Sir Henry Hartstonge, 3rd Baronet (c. 1725 – 1797) was an Irish politician and landowner who sat in the Irish House of Commons as member for Limerick; he was a close associate of his powerful brother-in-law Edmund Pery, 1st Viscount Pery. He gave his name to Hartstonge Street, Limerick.
He was born at Bruff, County Limerick, only son of Price Hartstonge, MP for Charleville, and Alice Widenham. Price was the eldest surviving son of Sir Standish Hartstonge, 2nd Baronet but died before his father, so that Henry inherited the title on his grandfather's death in 1751. The Hartstonges, who were originally from Norfolk, inherited Bruff from the Standish family and over the course of the next century century they became substantial landowners in Limerick, Cork and Tipperary. Henry was educated at Trinity College, Dublin of which he was later a benefactor.
Henry married Lucy Pery, sister of Edmund Pery, 1st Viscount Pery and of the 1st Baron Glentworth. Edmund Pery, who was Speaker of the Irish House of Commons 1771–1785, was one of the most influential politicians in Ireland of his day and Henry was always closely associated with the Pery interest. He sat in the House of Commons as member for Limerick 1776–1790.
He has been described as a popular and convivial character, who rather resembled the celebrated Irish "character" Sir Boyle Roche in his personality. He was accused of being an absentee landlord who spent most of his time in England and neglected his estates in Ireland. This however may be an unfair judgment since there is evidence that he worked closely with the Perys in the development of Limerick City, particularly the laying out of Newtown Pery and the building of the new Bishop's Palace. His wife Lucy, was renowned for her charitable work in Limerick; the couple gave their name to Hartstonge Street.