An apparatus for manufacturing a display device includes a mask arranged to face a substrate and a deposition source arranged to face the mask, wherein the mask includes a frame that includes a plurality of first frames that extend in a first direction and a plurality of second frames that extend in a second direction that intersects the first direction, an opening defined by the plurality of first frames and the plurality of second frames, and a plurality of laser marks located on at least one of the plurality of first frames and the plurality of second frames and generated by irradiating a laser beam.