An organic light-emitting display device includes a first anode electrode disposed in a first sub-pixel; a second anode electrode disposed in a second sub-pixel; a third anode electrode disposed in a third sub-pixel; at least one ground electrode disposed in the third sub-pixel and spaced apart from the third anode electrode; a first organic light-emitting layer, a first cathode electrode, a first portion of a second organic light-emitting layer, and a first portion of a second cathode electrode sequentially stacked on the first anode electrode and the second anode electrode; and a second portion of the second organic light-emitting layer and a second portion of the second cathode electrode sequentially stacked on the third anode electrode, wherein at least a portion of a side edge of the second portion of the second cathode electrode contacts the at least one ground electrode.