A mounting apparatus for fixing a fan defining fixing notches in an exterior surface of the fan to a chassis includes a frame. The frame includes a base panel fixed to the chassis, two side panels respectively extending up from opposite ends of the base panel, and two elastic fixing portions respectively extending up from the side panels away from the base panel. When the fan is disposed in the frame, the base panel, the side panels, and the fixing portions of the frame resist the exterior surface of the fan and the fixing portions are received in the corresponding fixing notches of the fan.