Mathilde Friederike Karoline Ludendorff was a German psychiatrist. She was a leading figure in the Völkisch movement known for her unorthodox (esoteric) and conspiratorial ideas. Her third husband was General Erich Ludendorff. Together with Ludendorff, she founded the Bund für Gotteserkenntnis, a small and rather obscure esoterical society of theists, which was banned from 1961 to 1977.

Erich Friedrich Wilhelm Ludendorff was a German general, politician and military theorist. He achieved fame during World War I for his central role in the German victories at Liège and Tannenberg in 1914.