The Mitsubishi Ki-83 (キ83) was a Japanese experimental, long-range heavy fighter designed near the end of World War II that did not reach production status.

[1] The machines displayed remarkable maneuverability for aircraft of their size, being able to execute a 671 m (2,200 ft) diameter loop in just 31 seconds at a speed of over 644 km/h (400 mph).

[3] Despite the bomb-ravaged Japanese manufacturing sector, plans for the Ki-83 to enter production were underway when Japan surrendered on 15 August 1945.

Most early photographs of the type were taken during the post-war occupation of Japan, when the four prototypes were seized by the United States Army Air Forces and repainted with USAAF insignia.

When they were evaluated by U.S. aeronautical engineers and other experts, a Ki-83, using high-octane fuel, reached a speed of 762 km/h (473 mph) at an altitude of 7,000 metres (23,000 ft).