A shelf guard 20 comprises at least one protective member 22 having at least an inner-facing (i.e. towards a support structure 40) surface 23 and at least one mounting member 24 having at least an inner-facing surface 27 that are preferably both made from a transparent and substantially rigid material, such as plastic or acrylic. An attachment element 30 (such as an adhesive strip or double sided tape) is included on the inner-facing surface 27 of at least one mounting member 24 to secure the shelf guard 20 to a shelf 40 by adhering to the shelf's underside surface 44 with the inner-facing surface 23 of the at least one protective member 22 extending upwardly from the edge of the support structure 40 to define an upwardly extending protective wall along the edge, thereby preventing objects stored on a surface of the support structure 40 from falling off the edge of the support structure 40. The attachment element 30 is preferably an adhesive having a peel-away protective film 32 that is removed immediately prior to installation.