A mask frame assembly includes a frame, and a mask tensioned on the frame in a first direction, the mask having a deposition pattern portion having a plurality of pattern holes therethrough, a deposition material being deposited on a substrate through the pattern holes, and a dummy portion extending from the deposition pattern portion in the first direction, the dummy portion having an increased thickness in a second direction as a distance from the deposition pattern portion in the first direction increases, the second direction being oriented along a normal to the mask.