Abstract: A fire extinguisher filling aid system includes a fire extinguisher and a fill nozzle that is positioned on and fluidly coupled to the fire extinguisher to fill the fire extinguisher. A bottom plate has a top side, a bottom side and a perimeter edge. A bottom end of the extinguisher is positioned on the bottom plate. An upper plate has an upper side, a lower side and a peripheral edge. The peripheral edge has a notch therein. The notch has a width smaller than the fill nozzle and larger than a fill line fluidly coupled to the nozzle to allow the fill line to be positioned within the notch while the upper plate rests upon the fill nozzle. A plurality of tethers is attached to and extends between the upper and bottom plates to retain the fill nozzle on the fire extinguisher.