Disclosed is a fixing apparatus for a video wall to fix a plurality of display panels disposed in a lattice pattern, including a plurality of top case units each positioned between neighboring ones of the display panels, each of the top case units comprising a middle frame inserted between the neighboring ones of the display panels to extend to rear surfaces of the display panels, and a bezel frame extending from the middle frame to opposite sides in a perpendicular direction to the middle frame to cover ends of front surfaces of neighboring display panels, and a fastening member fastened to the middle frame extending to the rear surfaces of the display panels to fix the display panels. In the fixing apparatus, neighboring display panels share one top case, and thus the gap between the display panels for a video wall may be reduced.