Piroska Jancsó-Ladányi (born Piroska Mária Ladányi; 15 January 1934 – 12 December 1954) was a Hungarian serial killer who killed five teenage girls in Törökszentmiklós between 1953 and 1954 in order to satisfy her sexual urges. Hanged in 1954, she remains one of the most infamous and insidious killers in Hungarian criminal history, with her case covered extensively in the novel Little Saints by author Szilárd Rubin.