An organic light emitting display (OLED) is provided. The OLED includes data line capacitors, which is disposed in a plurality of data lines included in a display panel. Each of the data line capacitors has a larger capacitance than a storage capacitor of each pixel. The data line capacitor includes the data line, an insulating layer, a metal, which are stacked. The metal is a cathode or a pixel electrode. The insulating layer of the data line capacitor is a passivation layer, a planarization layer, or a pixel defining layer. The capacitance of the data line capacitor is adjusted by controlling the thickness of the insulating layer or controlling the size of a via hole or a contact hole for controlling the thickness of the insulating layer.