A heat rejection panel that comprises a chassis having a first side, an opposing second side, and an aperture extending therethrough. The panel additionally comprises at least one oscillating heat pipe (OHP) plate disposed over a portion of the first side and/or the second side of the chassis. Each OHP plate includes a first face, an opposing second face, and a plurality of internal OHP channels. A portion of the first face and/or second face of each OHP plate is accessible for thermal interfacing with a heat source. A portion of the second face of each OHP plate is accessible for thermal interfacing with a heat sink. Each OHP plate will remove heat from the heat source, spread the removed heat throughout each OHP plate to provide an isothermal OHP plate, and reject the heat to the heat sink.