An organic light-emitting display apparatus includes a substrate; a plurality of pixels provided on a first surface of the substrate and each comprising a first area configured to emit light and a second area configured to have external light transmit therethrough; a pixel circuit unit provided in the first area of each of the plurality of pixels and comprising at least one thin-film transistor (TFT); a first electrode provided in the first area of each of the plurality of pixels and electrically connected to the pixel circuit unit; a second electrode facing the plurality of first electrodes, electrically connected throughout the plurality of pixels, and provided in at least in the first area of each of the plurality of pixels; an intermediate layer disposed between the first electrode and the second electrode and comprising an organic emission layer; and an inorganic insulating film provided in the second area of each of the plurality of pixels, and comprising a plurality of layers having different refractive indices, wherein at least one of the plurality of layers has a moth eye structure.