Richard FitzWilliam, 6th Viscount FitzWilliam
Richard FitzWilliam, 6th Viscount FitzWilliam (24 July 1711 - 25 May 1776), KB, PC, FRS, of Mount Merrion, near Dublin, Ireland, was an Anglo-Irish peer and property developer.
He was a grandson of Sir John Shelley, 3rd Baronet. He served as the Vice-Admiral of Leinster and was elected a Fellow of the Royal Society. He temporarily moved to Richmond Green in Surrey, but eventually returned to his family's principal seat in Mount Merrion, near Dublin.