A message display assembly for a vehicle that includes a display for displaying illuminated letter and numeral indicia. The display includes a housing that has a top wall, a bottom wall and a display screen that is mounted in the housing and extends between the top and bottom walls. A mounting is attached to the display for selectively attaching the display to an inner surface of a vehicle rear window. An input assembly is electrically coupled to the display for selecting word indicia that is then transmitting to the display so that the selected word indicia is displayed on the display screen.