Disclosed are a light emitting device, a method of fabricating the light emitting device, a light emitting device package, and a lighting system. The light emitting device includes a first conductive semiconductor layer, an active layer on the first conductive semiconductor layer, an electron blocking layer on the active layer, and a second conductive semiconductor layer on the electron blocking layer. The electron blocking layer includes a first electron blocking layer and an interrupted diffusion layer on the first electron blocking layer.