The Great Japan Youth Party , later known as the Great Japan Sincerity Association , was a nationalist youth organization in the Empire of Japan modeled after Nazi Germany's Hitler Youth. It was active from 1937 until its dissolution in 1945.

The Hitler Youth was the youth organisation of the Nazi Party in Germany. Its origins date back to 1922 and it received the name Hitler-Jugend, Bund deutscher Arbeiterjugend in July 1926. From 1936 until 1945, it was the sole official boys' youth organisation in Germany and it was partially a paramilitary organisation. It was composed of the Hitler Youth proper for male youths aged 14 to 18, and the German Youngsters in the Hitler Youth for younger boys aged 10 to 14.