Sir Hercules Langrishe, 1st Baronet of Langrishe (1729 – 1 February 1811) was an Irish politician.
He was the only son of Robert Langrishe of Knocktopher, County Kilkenny and educated at Trinity College, Dublin, where he graduated B.A. in 1763. He was a commissioner of barracks 1766–74, supervisor of accounts 1767–75, commissioner of revenue 1774–1801, and commissioner of excise 1780–1801.
He was first elected to represent Knocktopher in the Irish House of Commons in May 1761, and sat until he resigned his seat in March 1800. In 1776 he was also returned for Callan, but was declared not duly elected.
He married Hannah, the daughter and coheiress of Robert Myhill of Killerney, County Kilkenny by whom he had two sons and three daughters. The elder son Robert succeeded as second baronet, and died in 1835, having sat in the Irish parliament as M.P. for Knocktopher from 1796 to 1800. The second son James was archdeacon of Glendalough, dean of Achonry, and rector of Newcastle, Lyons, and Killishin, co. Carlow.
- T. H. S. Escott, Club Makers and Club Members (1913), pp. 329–333
- Burke's Peerage. 1959.
- Dunlop, Robert (1892). Lee, Sidney (ed.). Dictionary of National Biography. 32. London: Smith, Elder & Co. . In