A lens for a headlamp, the lens being at least partially formed from at least one plastic, having a lens surface and an edge surrounding the lens surface, from which at least one fastening element for fastening to a lens holder of the headlamp extends away from the lens surface, the at least one fastening element being designed as a fastening fork having two spaced-apart elastic fastening prongs. A lens system is also provided having a lens of this type and a lens holder, the lens holder having recesses corresponding to the fastening prongs, and the fastening prongs being elastically positioned by their outsides on outer insides of the recesses, or the fastening prongs being elastically positioned by their insides on inner insides of the recesses, so that the lens is fastened to the lens holder without play.