Abstract: An adjustable door strike having a striker plate (2), a main body (10) and a slider plate (16, 26, 32). The main body (10) is affixed to a door jamb with the slider plate (16, 26, 32) between the door jamb and the main body (10) and adjustably mounted for receiving a standard striker plate (2). The main body (10) is provided with an elongated aperture (12) in the vertical direction which permits the striker plate (2) to have a continuous range of adjustments in the vertical direction. Also described is a mounting template (50) for facilitating the installation of a door strike. This invention allows for mounting a door lock with either or both a latch and a deadbolt without adversely affecting the door jamb in any way.