A shelf divider system that includes a shelf base (12) defining a support for multiple products, which base has a front (16) and a rear (18) and multiple parallel elongate slots (50) in the base. The slots extend in a direction from front to rear in multiple sets (53) of at least two aligned slots. An upstanding transversely extending front stop (26) mounted to the base at the front has an upper edge (31) and at or adjacent the upper edge respective seats (46) associated with the sets of at least two aligned slots. A plurality of dividers (28) each have a bottom edge (36) with a more rearward rearwardly extending protrusion (42) and a more forward depending tab means (48), and a front edge (32) with an upper forwardly extending protrusion (44), whereby each divider is selectively releasably engageable with any of the sets of at least two aligned slots by locating the rearwardly extending protrusion under a rear edge of a rear slot and pivoting the divider downwardly to locate the tab means in a front slot and the forwardly extending protrusion in an associated seat on the front stop, whereupon the divider is not disengagable except by reversing the pivoting action.