A mask assembly, and an apparatus and method for manufacturing a display apparatus by using the mask assembly are provided. A mask assembly includes: a mask frame; a mask sheet on the mask frame and including a plurality of openings; at least two first shielding sheets on the mask frame and shielding some of the plurality of openings of the mask sheet; and at least two second shielding sheets on the mask frame and shielding some of the plurality of openings of the mask sheet, the at least two first shielding sheets and the at least two second shielding sheets define a deposition area including some of the plurality of openings of the mask sheet by shielding some of the plurality of openings of the mask sheet, and the deposition area is divided into a first deposition area and a second deposition area.