Gas valve mounting brackets improving the positioning of the valve stems in the aperture of gas cooking appliance as well as the alignment of the knobs with any graphics or insignia. In one aspect, a bracket directly couples a gas valve to a bottom surface of a cooktop of cooktop appliance. This direct coupling more accurately positions a valve stem of the gas valve in the center of a cooktop aperture through which it extends. A knob attached to the valve stem is also more accurately aligned with graphics and/or insignia on the cooktop.