Abstract: A stacking wire for produce trays is made from a length of wire, preferably a uniform round high tensile strength steel wire of at least 14 gauge, bent into an elongated open U with both sides thereof diverging downwardly to open ends at which they are bent outwardly to form further outwardly diverging legs which terminate in hook-shaped feet, with the hook openings facing outwardly and with the ends of such hooks bending upwardly. A stacking wire of the type described, when installed in a produce tray by being inserted through a slotted bottom portion and then through a top opening in such tray, will be compressed by such tray slots so that the sides thereof are essentially parallel, and the hook shaped feet of the wire will be held in place pressing against end walls of the bottom slot of the produce tray and with the ends of the wire digging into the tray bottom to help to maintain the wire in position even when additional tray(s) are stacked on the supporting tray and the stacking wire.