Urinal mat having a flexible, gridded, porous top layer, a disposable, highly liquid-absorbent pad or pad-type middle layer, and an effectively waterproof bottom layer, heavy enough to stay in place without adhesives, and thin enough, with tapered sides, to avoid being a tripping hazard. The top layer fits within a recess in the bottom layer and interlockingly attaches to the bottom layer, with the pad in-between. The interlocking attachment is accomplished by the fitting of horizontal protrusions on the perimeter of the top layer fitting into corresponding peripheral recesses in the bottom layer, and provides a smooth level horizontal top surface of the mat.