After World War II, an international military court sentenced 20 Nazi doctors and 3 collaborators with crimes against the humanity at the Nuremberg Trials. For the past 70 years after Nuremberg Trials, the restoration to pre-Nazi’s ethical standard has been progressed. The eugenicist theories and the policies of racial hygiene were the fundamental axes of the Nazi euthanasia programs without paying attention to the basic ethics of the medicine. German psychiatry that it enjoyed an extraordinary international reputation, played a capital rôle in these programs and the mental patients supposed the main group of risk for these practices during the Nazi era. In this overview, we deal with, the historical perspective of the euthanasia programs o...