A composite hockey stick blade having a rib stiffening system. The rib stiffening system consists of one or more internal wall structures, or ribs, located within strategic portions of the rear face of the paddle that provides localized regions of increased longitudinal stiffness located within the overall structure of the paddle. These ribs may also control the torsional rigidity of the paddle. The ribs also reduce the weight of the blade without reducing the stiffness and rigidity of the blade. The hockey stick blade may be utilized as a replacement blade for a two-piece hockey stick, or may be a portion of a one-piece hockey stick.