The Occupation of Japan (連合国占領下の日本, Rengōkoku senryō-ka no Nihon) was a military occupation of Japan in the years after Japan's defeat in World War II. It was led by the United States with the support of the British Commonwealth and the supervision of the Far Eastern Commission. The occupation was led by American General Douglas MacArthur, who was appointed Supreme Commander for the Allied Powers by US President Harry Truman.
Emperor Hirohito stayed on the imperial throne and was given full immunity from prosecution for war crimes after he agreed to replace the wartime cabinet with a ministry approved by the Allies.
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The occupation officially ended when the San Francisco Peace Treaty was signed on September 8, 1951, and became into effect on April 28, 1952.