A chip-on-film package includes a base film including an upper surface and a lower surface that opposite from each other, a semiconductor chip mounted on the upper surface of the base film, a heat emission layer disposed on the lower surface of the base film to at least partially overlap the semiconductor chip in a thickness direction, an insulating layer disposed on a lower surface of the heat emission layer, and a protective layer surrounding side and lower surfaces of the insulating layer. Accordingly, thermal fatigue of the chip-on-film package may be reduced, and reliability may be increased.