Rear axle suspension system for motor vehicles, in which the wheel carriers on both sides are coupled to the body of the vehicle by at least one longitudinal link (9, 10), one transverse link (12) and a further transverse link (15, 16). In order to ensure that the axle kinematics distinguish between spring compression in the same direction and spring compression in opposite directions and a side force steering effect occurs, the transverse link (12) is a single connecting link which is connected to the two wheel carriers (3, 4) via first joints (5, 6) and connects both wheel carriers (3, 4), and the center of which (19) is guided, with respect to the body of the vehicle, in the longitudinal center plane of the vehicle, by a straight-guide (20 to 24). The straight-guide (20 to 24) is a Watt linkage (23, 24, 20).