An organic light-emitting display apparatus includes a substrate, a first electrode disposed on the substrate, a pixel-defining layer which is disposed on the substrate and the first electrode and in which an opening which exposes a central part of the first electrode is defined, an interlayer which is disposed on the first electrode and comprises an organic light-emitting layer; and a second electrode disposed on the interlayer, where a sidewall of the opening comprises a bumpy structure in which a plurality of bumps is disposed.