A frame assembly and a display device are provided. The frame assembly includes a back plate, a first frame and a fixing assembly. The back plate comprises at least one side edge, and the side edge has an extending direction. The first frame is combined with the back plate. The fixing assembly includes at least one first engaging structure, at least one second engaging structure and a fixing member. The first engaging structure is disposed on the at least one side edge of the back plate. The second engaging structure is disposed on at least one side edge of the first frame. The fixing member is inserted into and combined with the at least one first engaging structure and the at least one second engaging structure along the extending direction.