Label holders adapted to be mounted on a supporting surface formed of a grid of wire rods, such as a wire basket, a wire rack, a wire shelf or the like. The label holder includes a planar backing element supporting the label holder portion for viewing at a preselected angle, with a trapezoidal connector formed in the backing element to snappingly engage over a horizontally extending wire rod of the grid. The trapezoidal connector may include a plurality of flexible bumps or ridges for enhanced gripping of the wire rods of the grid. The remainder of the backing element rests against the vertically extending wire rods of the grid.