An organic light-emitting display device may include a plurality of scan lines, a plurality of data lines, and a plurality of pixels located at an intersection region of the scan line and the data line, wherein the organic light-emitting display device includes a thin film transistor including a gate electrode on a different layer than a scan line, an active layer on the gate electrode, and source and drain electrodes that are in contact with source and drain regions of the active layer, and a capacitor including a first capacitor electrode on the same layer as the scan line, a second capacitor electrode on the gate electrode, and a third electrode on the same layer as the source and drain electrodes.