A transparent display device according to example embodiments includes a substrate having a pixel area and a transmission area, a pixel circuit on the pixel area of the substrate, an insulation structure on the substrate to cover the pixel circuit, a first electrode on the pixel area of the substrate, the first electrode being at least partially penetrated the insulation structure and electrically connected to the pixel circuit, a display layer on the first electrode, a second electrode facing the first electrode and covering the display layer, and an anti-diffraction layer on the substrate, the anti-diffraction layer at least partially overlapping the transmission area and including a plurality of nano wires.