Abstract: A lockable cover assembly for a push-button key pad, such as for telephones or the like, includes a face plate having apertures through which the push-buttons extend outwardly. The face plate also includes a plurality of slots along one edge thereof, and a lock access hole disposed adjacent to the opposing edge. A key pad cover includes a plurality of locking lugs along one edge which engage the slots of the key pad cover, and a lock disposed at the opposing edge of the cover. The lock includes a shaft which extends through the access hole of the cover to engage an inner portion of the housing of the unit being protected.