The Isuzu Elf is a medium-duty commercial vehicle, built across six generations continually since 1959. Known in the United States as the N-Series or NPR, the Elf is a cab-over-engine commercial truck offered in a variety of bodystyles or as a chassis-cab configuration for upfitting. Over the course of production, the Elf has been powered by a variety of inline four and inline six gasoline or diesel engines.