Ann-Mari, Princess von Bismarck-Schonhausen

Ann-Mari, Princess of Bismarck (née Tengbom; 26 July 1907 – 22 September 1999) was a Swedish socialite and the wife of Otto Christian Archibald, Prince of Bismarck. She and her husband were both prominent members of the Nazi Party.

Ann-Mari was born on 26 July 1907 in Stockholm. She was the daughter of Swedish architect Ivar Tengbom. She attended school in Stockholm, where she was a classmate of Folke Bernadotte, Count of Wisborg.

On 18 April 1928 she married German politician and diplomat Otto Christian Archibald, Prince of Bismarck in a Lutheran ceremony at the Berlin Cathedral. They had six children:

• Countess Mari Ann (1929–1981).
• Ferdinand, Prince of Bismarck (1930–2019)
• Count Carl Alexander (1935–1992).
• Count Maximilian Viktor (born 1947).
• Countess Gunilla Margaretha (born 1949)
• Count Eduard Leopold (born 1951).

She and her husband moved into a villa in Rome, where she was known to have thrown lavish parties for members of Italian and German high society.

She died on 22 September 1999 in Marbella, Spain.