Abstract: The present invention relates to fuel atomizers and fuel injectors capable of being configured to atomize fuel for internal combustion engines. A fuel atomizer for engagement to a fuel injector comprises a nozzle and one or more stacked wafers disposed within the nozzle. The nozzle has an input aperture adapted to engage an outlet of a fuel injector, an output aperture for discharging fuel injected by the fuel injector, and an air supply aperture for receiving air into the nozzle. The wafers are adapted to enable received air to impart energy on the fuel injected from the fuel injector and to enable the fuel to be discharged from the output aperture. A fuel injector capable of being configured to atomize fuel is also provided, in which a fuel injector body is configured to output a fuel spray and the fuel atomizer nozzle discharges the fuel spray.