The guide for sliding glazing intended to be added and fastened onto a glazing and to cooperate with a sliding joint. The guide comprising a body of elongated shape and a longitudinal base extending along the axis of elongation of the body. A first face of the guide applied and fastened onto a glazing surface and a second face opposite the first face, the second face cooperating by sliding with said joint. The longitudinal base including a thinned portion at at least one free longitudinal end. A thickness of the thinned portion, in a direction substantially perpendicular to said first face, decreasing at least in the longitudinal direction in such a way that said second face is flush with said glazing surface on said at least one free end.