The fate of Jewish psychiatric patients in occupied Europe during World War II is inseparable from the fate of the disabled and mentally ill, as planned by the Nazi regime. But Jews found themselves at the confluence of eugenics, Christian anti-Judaism and Nazi racist and anti-Semitic madness. They faced the twin promise of death - both as Jews and as mentally ill. They did not escape from the euthanasia programme and, if by a miracle they survived, they disappeared into the extermination camps. The modalities of annihilation of Jewish psychiatric patients are inseparable from the forms of German occupation, which differed from country to country. In this research we focus initially on various countries in occupied Europe, and then on France.