A light emitting device package, and a lighting system includes a light emitting device. The light emitting device includes a substrate, a first conductive semiconductor layer on the substrate, an active layer on the first conductive semiconductor layer, and a second conductive semiconductor layer on the active layer. A first via electrode contacts the first conductive semiconductor layer through a via hole formed through the substrate, and a second via electrode contacts the second conductive semiconductor layer through a second via hole formed through the substrate, the first conductive semiconductor layer, and the active layer.