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The Ho-203 was a Japanese autocannon that saw considerable use in World War II. It was a long-recoil automation of the Year 11 Type direct fire infantry gun. It was fed by a 15-round closed-loop ammunition belt. It was operationally used only as the nose gun of the Ki-45 KAI heavy fighter of the Imperial Japanese Army, and tried out in the upper fuselage of the III-KAI variant of the Mitsubishi Ki-46 Dinah twin-engined warplane as a Japanese form of the Nazi Luftwaffe's Schräge Musik upwards-aimed armament system for heavy fighters.