An organic light-emitting display apparatus includes a substrate; a pixel electrode over the substrate; a pixel-defining layer including an opening that exposes at least a portion of the pixel electrode; an intermediate layer, which is over the portion of the pixel electrode exposed by the opening and includes an organic emission layer; a counter electrode over the intermediate layer; and an encapsulating structure, which is over the counter electrode and includes at least one inorganic layer and at least one organic layer, and the at least one organic layer includes quantum dots and is in the opening.