Richard Stanyhurst (1547–1618) was an Irish alchemist, translator, poet and historian, born in Dublin.
His father, James Stanyhurst, was Recorder of the city, and Speaker of the Irish House of Commons in 1557, 1560 and 1568. Richard was sent to Peter White's Kilkenny College after which, in 1563, he continued to University College, Oxford, where he took his degree five years later. At Oxford he became intimate with Edmund Campion. After leaving the university he studied law at Furnival's Inn and Lincoln's Inn. He contributed in 1587 to Holinshed's Chronicles of England, Scotland, and Ireland "a playne and perfecte description" of Ireland, and a History of Ireland during the reign of Henry VIII, which were severely criticized in Barnabe Rich's New Description of Ireland (1610) as a misrepresentation of Irish affairs written from the English standpoint. They also caused offence to Catholics for their anti-Catholic perspective. After the death of his wife, Janet Barnewall, daughter of Sir Christopher Barnewall (whom he praised warmly in his contribution to Holinshed), in 1579, Stanyhurst went to the Netherlands. After his second marriage, which took place before 1585, to Helen Copley, he became active in the Catholic cause. He lived in the bishopric of Liège, where he got in touch with the Paracelsan movement gathered around Ernest of Bavaria (1554–1612). From then, Stanihurst analysed the relationships between medicine and chemistry.
In the early 1590 he was invited to Spain by King Philip II, who became seriously ill. Stanihurst worked at the great alchemical laboratory in El Escorial. At the same time he informed the state on Catholics' interest in England. After his wife's death in 1602 he took holy orders, and became chaplain to the Archduke Albert of Austria in the Netherlands. His son was William Stanyhurst.