The Emperor in August (Japanese: 日本のいちばん長い日, literally "Japan's Longest Day") is a 2015 Japanese historical drama film directed by Masato Harada. It was released on August 8, 2015.

A remake of Japan's Longest Day (1967), the film depicts the chain of command of Imperial Japan's government, military, and War Council under Emperor Shōwa (Hirohito) in the immediate period before the surrender of Japan in World War II between April 1945 to 15 August 1945 (Hirohito surrender broadcast), chronicling Kantarō Suzuki's term as the Prime Minister and the final months of War Minister Korechika Anami, the Allied firebombing of Tokyo on May 25, preparations for Operation Ketsugō, the leadership's response to the Potsdam Declaration, Soviet–Japanese War and the atomic bombings of Hiroshima and Nagasaki, and the failed military coup intended to foil Japan's declaration of surrender.