Abstract: Disclosed universal pallet stackers may include a frame, a pallet transport assembly, a pallet delivery assembly, and at least one stop plate that extends above the transport assembly. The transport assembly may include moveable transport tracks that receive an assembled pallet and move it downstream until it contacts the upstream side of the stop plate. The pallet delivery assembly may include extendable arms that: lift the pallet above the stop plate, move the pallet downstream of the plate, bring the pallet into contact with the downstream side of the stop plate, and slide the pallet off of the arm assemblies to thereby stack the pallet in a stacking location. Associated methods of using universal pallet stackers are also disclosed.