Abstract: A free-standing modular wall system (10, 110) utilizing a plurality of individual slat members (22) stacked vertically one upon the other to form panels (12, 14) and supported upon upright end members (20) having a foot or base (16, 116) whereby the resulting module may be moved from place to place and joined with other such modules to form a longer wall. Preferably, the slats (22) are formed of sheet metal and mounted on transverse hanger brackets (24), to which some or all of the slat members (22) may be either fixedly or movably by interlocking slidable engagement. Preferably, the panels, (12, 14) consisting of slats (22) and hanger brackets (24) are removably mounted upon the upright supports (20). The modular wall system units (10, 110) may either be single-faced or double-faced, i.e., may have only a single slat-wall panel (12, 14) or may have a pair of such panels disposed back-to-back, for use in installations where both sides are fully exposed.