Provided are a light emitting device, a light emitting device package, and a lighting system. The light emitting device includes a light emitting structure including a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer, and a passivation layer protecting a surface of the light emitting structure. The passivation layer includes a first passivation layer on a top surface of the light emitting structure and a second passivation layer having a refractive index different from that of the first passivation layer, the second passivation layer being disposed on a side surface of the light emitting structure. The second passivation layer has a refractive index greater than that of the first passivation layer.