A display apparatus and a liquid crystal lens are provided. The display apparatus includes a display panel and a liquid crystal lens. The liquid crystal lens includes a first substrate, a second substrate, a liquid crystal layer, a first electrode layer, a second electrode layer, a third electrode layer, and an insulating layer. The liquid crystal layer is between the first and second substrates. The first electrode layer is between the first substrate and the liquid crystal layer. The second electrode layer is between the second substrate and the liquid crystal layer. The third electrode layer is between the second electrode layer and the second substrate. The liquid crystal layer is driven by the first, second, and third electrode layers and has a refractive index that is first decreased and then increased to define a lens unit. The insulating layer is between the second and third electrode layers.