Abstract: A door lock, particularly well suited for use with a safe which includes a movable door latch mechanism having a lock bolt abutment surface. The door lock comprises a casing having a locking bolt-receiving aperture in one of its walls. The casing is to be mounted to the door, for example, on the inside surface of the door with the bolt-receiving aperture adjacent the bolt-abutment surface of the door latch mechanism. A locking bolt is longitudinally slidably mounted with the casing for movement at an acute angle relative to the bolt abutment surface of the door latch mechanism between a locked position projecting through the aperture in the casing and into abutment with the abutment surface of the door latch mechanism and an unlocked position out of abutment with the abutment surface of the door latch mechanism and retracted into the casing.