Stephanie Freifrau von und zu Guttenberg (born Stephanie Gräfin von Bismarck-Schönhausen; 24 November 1976) is a German activist against child abuse, and the president of the German section of Innocence in Danger, a human rights NGO working to protect the rights of children on the Internet and working to restrict the spread of child pornography, and a co-author of a book about these topics.
She is the wife of Karl-Theodor zu Guttenberg, the former German Minister of Defence. A member of the Bismarck family, she is the great-great-granddaughter of Chancellor Otto, Prince of Bismarck, and great-granddaughter of Foreign Secretary Herbert, Prince of Bismarck. She is also a descendant of Robert Whitehead, the inventor of the torpedo, through diplomat Alexander, Count of Hoyos.
Born in Munich, Stephanie zu Guttenberg is the only daughter of Andreas Graf von Bismarck-Schönhausen and Charlotte Kinberg, a Swedish interior architect with partial Dutch/German ancestry. She has two older half-siblings on her mother's side. Guttenberg grew up bilingual, and in addition to her native German and Swedish, she speaks English, French and Italian.