The Kawasaki Ninja H2 is a supercharged four-stroke supersport-class motorcycle in the Ninja sports bike series manufactured by Kawasaki, featuring a variable-speed centrifugal supercharger.

Its namesake is the 750 cc Kawasaki H2 Mach IV,an inline triple that was introduced by Kawasaki in 1972 to "disrupt what it saw as a sleeping motorcycle market".

Its Ninja H2R track-only variant is the fastest and most powerful production motorcycle on the market, producing a maximum of 310 horsepower (230 kW) and 326 horsepower (243 kW) with ram-air. The H2R has 50% more power than the fastest street-legal motorcycles while the street-legal Ninja H2 has a lower power output of 200 hp (150 kW)^[21]–210 hp (160 kW) with ram-air.