An organic light emitting display panel includes a base substrate, a pixel defining layer disposed on the base substrate, a light emitting structure disposed in an opening of the pixel defining layer, and a mirror pattern disposed on an upper surface of the pixel defining layer. The pixel defining layer defines the opening and includes the upper surface that is in parallel with a surface of the base substrate and a side surface that is connected to the upper surface. The mirror pattern makes contact with the pixel defining layer, and entirely covers the upper surface of the pixel defining layer.