Abstract: A window support apparatus positively supports a glass panel of an automobile side window in its upward or closed position while disconnected from its supporting window regulator mechanism. The support apparatus includes a support frame, a pair of suction cups for clamping the apparatus to the window glass, and a pair of slides which fit in the window channel of the door between the glass panel and the exterior or interior door panel. The window support apparatus opposes sudden downward movement of the window glass panel resulting from gravity, and is removably installed on the automobile door to prevent inadvertent falling of the glass panel into the door cavity while repair work is performed on the door or the door's interior components.