An organic light emitting diode includes a first electrode layer disposed on a base substrate, a second electrode layer disposed on the first electrode layer and facing the first electrode layer, an emitting layer disposed between the first electrode layer and the second electrode layer, a hole transport region disposed between the emitting layer and the first electrode layer, an auxiliary layer disposed between the hole transport region and the emitting layer, the auxiliary layer including a first material and a second material, and an electron transport region disposed between the emitting layer and the second electrode layer, in which a lowest unoccupied molecular orbital (LUMO) energy level of the first material is higher than a LUMO energy level of the emitting layer, and a LUMO energy level of the second material is lower than the LUMO energy level of the emitting layer.