Abstract: A security lock guard adapted to engage a sliding bolt and to be mounted overlying the recess on the door jamb consisting of a flat plate having an opening corresponding with said recess to receive said bolt, said opening being provided with a plurality of removable tabs so as to accommodate the width of differently sized bolts; and a flange extending outwardly and perpendicularly from the outer edge of said flat plate and in contact with the inner surface of the door stop disposed on the door jamb. This perpendicular flange acts as a barrier against the insertion of a thin blade or other object between the door edge and the jamb even if the door stop is lifted or removed from the door jamb.