Who was the leader of the Italian fascist regime during World War II?

The leader of the Italian fascist regime during World War II was Benito Mussolini. He established a totalitarian state in Italy and aligned his country with Nazi Germany under Adolf Hitler. Mussolini's fascism emphasized authoritarian governance, national pride, and militarism, which played a significant role in Italy's involvement in the war. Mussolini's policies and decisions not only shaped the trajectory of Italy during this tumultuous time but also contributed to the broader conflicts of World War II.

In contrast, Adolf Hitler was the leader of Nazi Germany, Joseph Stalin led the Soviet Union, and François Mitterrand was a French politician who rose to prominence after World War II. Each of these figures had significant influence in their respective countries, but Mussolini's role as the head of the Italian fascist regime makes him the correct answer for this particular question.