Adolf Hitler's 50th birthday was celebrated as a national holiday in Nazi Germany.

Adolf Hitler's 50th birthday was celebrated as a national holiday throughout Nazi Germany on 20 April 1939. Minister of Propaganda Joseph Goebbels made sure the events organised in Berlin were a lavish spectacle focusing on Hitler himself. The festivities included a military parade with some 40,000 to 50,000 German troops taking part, along with 162 Luftwaffe airplanes flying overhead. The parade was intended in part as a warning to the Allied powers of Nazi Germany's military capabilities. The parade lasted for more than four hours, with 20,000 official guests, along with several hundred thousand spectators being present.

Nazi Germany, officially the German Reich and later the Greater German Reich, was the German state between 1933 and 1945, when Adolf Hitler and the Nazi Party controlled the country, transforming it into a totalitarian dictatorship. The Third Reich, meaning "Third Realm" or "Third Empire", referred to the Nazi claim that Nazi Germany was the successor to the earlier Holy Roman Empire (800–1806) and German Empire (1871–1918). The Third Reich, which the Nazis referred to as the Thousand-Year Reich, ended in May 1945, after 12 years, when the Allies defeated Germany and entered the capital, Berlin, ending World War II in Europe.