When did the Nazi party end?

The Nazi Party effectively ended in May 1945 with the defeat of Nazi Germany in World War II. Following Adolf Hitler's suicide on April 30, 1945, and Germany's unconditional surrender on May 7, 1945, the party was officially banned by Allied forces. The Nuremberg Trials, which began in late 1945, further disbanded the party's leadership and held many key members accountable for war crimes.