Abstract: A balloon printing apparatus for printing an image on the outer surface of a number of inflatable elastic balloons of the type defining a main body and a neck opening allowing access into the main body. The apparatus comprises: a conveyor device movable in a closed path in an intermittent manner; a plurality of nozzles spacedly carried by the conveyor device, insertable into a balloon neck opening and for inflating a balloon; as many balloon supporting frames as air nozzles, carried by the conveyor device, each nozzle adjacent to a corresponding frame, each frame sized to partly surround and support the main body of an inflated balloon installed on the adjacent nozzle with a portion of the inflated balloon protruding from the frame. The body remains in a stable position relative to the conveyor device while the inflated balloon is transported by the nozzle and frame through the closed path.