The invention relates to a steering lock for locking the steering spindle (2) of a motor vehicle steering system comprising a blocking element (5) displaceable in the direction of the longitudinal axis (3) thereof from a locking to an unlocking position by means of an electromechanical drive (6) and is maintainable in said unlocking position by a spring-loaded securing element (7) in the form of a lever. In order to enable the securing element (7) to maintain the blocking element (5) in the unlocking position thereof in a simple manner even when the electromechanical drive (6) generating the displacement of said blocking element (5) is embodied in the form of a worm drive, a worm gear (10) representing a first control contour (12) is used and a first cam (11) for displacing the blocking element to the unlocking position is mounted on said worm gear. A second cam (19) for actuating the securing element (7) supportedly mounted on the fist control contour (12) or on a second separate control contour (62) is also arranged on the worm gear (10) in such a way that prior to the displacement of the blocking element (5) from the unlocking position to the locking position, the securing element (7) being in the rest position is pivoted or displaced in the released position and, only afterwards, the first control contour (12), enables the blocking element (5) to be displaced to the locking position.