An OLED display includes: a first pixel including a first pixel electrode of a pixel electrode, a second pixel including a second pixel electrode of the pixel electrode, and a third pixel including a third pixel electrode of the pixel electrode; a resonance assistance layer on the first pixel electrode; an organic emission layer including a first organic emission layer on the resonance assistance layer and the second pixel electrode, a second organic emission layer on the first organic emission layer, and a third organic emission layer on the third pixel electrode; a common electrode on the organic emission layer; and a color mixture preventing layer on the common electrode and configured to absorb overlapped light in an overlapped wavelength region of a wavelength region of first light emitted by the first organic emission layer and a wavelength region of second light emitted by the second organic emission layer.