Anna Marie Hahn (née Filser; July 7, 1906 – December 7, 1938) was a German-born American serial killer.

At age 19, she became pregnant with her son Oskar, and told her family that the father was a Viennese physician, Dr. Max Matscheki, a well-known cancer researcher.

[2] Hahn allegedly began poisoning and robbing elderly men in Cincinnati's German community to support her gambling habit.

[7] Police said that Obendoerfer, a cobbler, "died in agony just after Mrs. Hahn had bent over his deathbed inquiring his name, professing she did not know the man".

[6] An autopsy revealed high levels of arsenic in Obendoerfer's body, which aroused police suspicions.