Jet ski is the brand name of Kawasaki Heavy Industries personal water craft. The name, however, is often used as a generic term for other makes of personal watercraft. Typically these craft are propelled by rapidly expelling water behind them in a jet, rather than turning a screw in propeller driven ships.

Because of their relatively low cost they are widely used on water bodies across the world. Whilst many are used responsibly and with regard to the natural environment, a minority are used recklessley and with little regard to the noise and environmental impact that they can cause. As a result there are pressures in many parts of the world for regulation in the use and management of such craft.

de:Jet-Ski