Syr Winston Leonard Spencer-Churchill, KG, OM, PC, FRS (30 mis Du 1874 – 24 mis Genver 1965) o pennmenyster Ruwvaneth Unys a 1940 dhe 1945, hag arta a 1951 dhe 1955. Churchill o pennmenyster Ruwvaneth Unys dre'n brassa rann Nessa Bresel an Bys.