A mask frame assembly and a method of manufacturing the same are disclosed. In one aspect, the mask frame assembly for an organic light-emitting diode display includes a frame including a supporting unit, wherein an opening is formed in the frame. The assembly also includes a unit mask including a deposition pattern portion, wherein the unit mask extends in a first direction, and is fixed to the supporting unit. The assembly further includes a first supporter configured to support the unit mask, wherein a magnet is placed on at least one portion of the first supporter.