The Hitler Oath —also referred in English as the Soldier's Oath—refers to the oaths of allegiance sworn by officers and soldiers of the Wehrmacht and civil servants of Nazi Germany between the years 1934 and 1945. The oath pledged personal loyalty to Adolf Hitler in place of loyalty to the constitution of the country. Historians view the personal oath of the Third Reich as an important psychological element to obey orders for committing war crimes, atrocities, and genocide. During the Nuremberg trials, many German officers unsuccessfully attempted to use the oath as a defence against charges of war crimes and crimes against humanity.

The Wehrmacht were the unified armed forces of Nazi Germany from 1935 to 1945. It consisted of the Heer (army), the Kriegsmarine (navy) and the Luftwaffe. The designation "Wehrmacht" replaced the previously used term Reichswehr and was the manifestation of the Nazi regime's efforts to rearm Germany to a greater extent than the Treaty of Versailles permitted.