A protective film includes a first film, a second film, and a panel protective film disposed between the first film and the second film. The panel protective film includes a first portion and a second portion spaced apart from each other along a first direction. The first portion includes a first side and a second side opposite to each other along the first direction, a third side and a fourth side opposite to each other along a second direction crossing the first direction, and a first curvilinear portion connecting the second side to the fourth side, the first curvilinear portion corresponding to first respective corners of the first film and the second film and having a curved shape. The first side faces the second portion, and the first curvilinear portion is disposed inside edges of the first film and the second film at the first respective corners thereof.