Sir Horace Curzon Plunkett KCVO PC (Ire) JP DL FRS (24 October 1854 - 26 March 1932), was an Anglo-Irish agricultural reformer, pioneer of agricultural cooperatives, Unionist MP, supporter of Home Rule, Irish Senator and author. Plunkett, a younger brother of John Plunkett, 17th Baron of Dunsany, was a member of the Congested Districts Board for Ireland for over 27 years, founder of the Recess Committee and the Irish Agricultural Organisation Society (IAOS), Vice-President (operational head) of the Department of Agriculture and Technical Instruction (DATI) for Ireland (predecessor to the Department of Agriculture) from October 1899 to May 1907, MP for South Dublin in the House of Commons of the United Kingdom from 1892 to 1900, and Chairman of the Irish Convention of 1917-18.