Allied Leaders The President of US was Franklin D. Roosevelt.
The Prime Minister of France was Edouard Daladier, but it was Charles de Gaulle who led the Free French Forces.
The dictator of the USSR was Josef Stalin.
It's easy to forget that Winston Churchill was not PM at the beginning of the war. Neville Chamberlain was the PM until he lost the confidence of the government and was replaced by Churchill and a coalition government.
The President of China was Chiang Kai Shek.
The central three leaders were Roosevelt, Stalin, and Churchill. The former three leaders are seen in a famous picture taken at the Yalta Conference.