An organic light emitting diode and a method of manufacturing the same are provided. The organic light emitting diode includes: a first electrode disposed on a substrate; an organic layer including at least an emitting layer disposed on the first electrode; and a second electrode including at least two layers and a Ca thin layer interposed between the at least two layers on the organic layer. In this case, the Ca layer acts as a moisture-absorbing material for preventing moisture and oxygen from penetrating, so that pixel shrinkage and dark spot defects due to the penetration may be prevented, thereby providing an organic light emitting diode and a method of manufacturing the same without using any moisture absorbing material at the time of encapsulation.