An organic light emitting diode comprises a transparent electrode, an organic emission layer, an anti-reflective electrode and an auxiliary electrode. The organic emission layer is disposed between the transparent electrode and the anti-reflective electrode. The anti-reflective electrode includes a first conductive layer, a second conductive layer, and a non-metal layer. The first conductive layer is disposed between the organic emission layer and the non-metal layer. The non-metal layer is interposed between the first conductive layer and the second conductive layer. The auxiliary electrode penetrates the non-metal layer to connect the first conductive layer with the second conductive layer. The organic light emitting diode can be applied to an organic electroluminescent device.