Edwin Maria Katzenellenbogen, also spelled Katzen-Ellenbogen (22 May 1882 – after 1955) was a Jewish American eugenicist and physician in the concentration camp of Buchenwald.

Born in 1882 in Galicia, he attended a Polish Jesuit high school, and was a practicing Catholic.

[2] Katzenellenbogen married Aurelia Pierce, the daughter of a Massachusetts Supreme Court Justice, whom he later divorced.

After being found guilty, Katzenelenbogen requested a death sentence, saying "You have placed the mark of Cain on my forehead.

He did not receive the death sentence he requested after military prosecutors failed to prove that he killed anyone, instead of only being found guilty of committing non-fatal abuse.