Abstract: A urine deflector is disclosed for attachment to the underside of a toilet seat for blocking the gap between the toilet seat and the top of the rim of the toilet bowl at the front, e.g. to prevent urine or splashes from leaking through the gap. The deflector body comprises a length of flexible material with surfaces that are water resistant and taper from an attachment surface to a lower drip edge. When installed, the deflector body is curved to follow the curvature of the rim of toilet bowl and the deflector surface is also preferably concave in vertical cross-section. The attachment surface may comprise a self-adhesive strip. The deflector is low cost, easy to install, and unobtrusive when installed. A flexible universal design may be adapted readily for retrofit installation on standard toilet seats.