The Kawasaki Ki-100 (キ100) was a Japanese fighter aircraft during the Second World War. The Japanese Army designation was "Type 5 Fighter" (五式戦闘機, Go-shiki sentouki, or abbreviated as Goshikisen). Unlike some other Japanese aircraft, it was not assigned an Allied code name.
It was developed in early 1945 as an emergency measure to convert the Ki-61 airframe to accept a 14-cylinder Mitsubishi Ha-112-II radial engine in place of the original Kawasaki Ha-40 inverted V-12 inline engine, due to the factory for the latter being destroyed by the US bombing raid.
