Madge Augustine Oberholtzer (November 10, 1896 – April 14, 1925) was a white American woman whose rape and murder played a critical role in the demise of the second incarnation of the Ku Klux Klan. In March 1925, while working for the state of Indiana on an adult literacy campaign, Oberholtzer was abducted by D. C. Stephenson, Grand Dragon of the Indiana Klan. Holding her captive in his private train car, Stephenson raped and tortured her. Oberholtzer died from a combination of a staphylococcal infection from her injuries and kidney failure from mercury chloride poisoning, which she took while held captive in an attempt to commit suicide.