The Nationalsozialistische Deutsche Arbeiterpartei ( National Socialist German Workers ' Party , NSDAP ) , also known as the Nazi Party , was a German political party . The National Socialist German Workers ' Party ( , abbreviated NSDAP ) , commonly known in English as the Nazi Party ( from the German Nazi , abbreviated from the pronunciation of Nationalsozialist ) , was a political party in Germany between 1919 and 1945 .