Abstract: A shelf divider adapted to support and organize objects located on the shelf. The shelf divider includes an upper and a lower web portion adapted to be positioned against the exposed edges surface of the shelf, a base plate extending perpendicularly from the upper web and a clamp arm extending from the lower web in opposed relation to the base plate. The clamp arm is movable between a closed position and an open position. The clamp arm is biased toward the closed position so that, when in the mounted state, the clamps free-end portion bears against the lower surface of the shelf. The base plate has connected to it a relatively flat divider panel. The divider panel is adapted to have sides which are in facing relationship with the objects of the shelf. Further, the divider panel includes stiffening ribs on each side of the divider panel. The stiffening ribs project outwardly from the divider plane to resist deflection of the divider panel when it is mounted on the shelf.