Leonarda Cianciulli (18 April 1894 – 15 October 1970) was an Italian serial killer.
Better known as the "Soap-Maker of Correggio" (Italian: la Saponificatrice di Correggio), she murdered three women in the town of Correggio, Reggio Emilia, between 1939 and 1940, and turned their bodies into soap and teacakes.