Abstract: A lock for medicine cabinet doors and the like has a base or mounting element attachable to a cabinet side wall. A retaining and guidance bar for a lock body extends from the base element laterally outwardly of the cabinet side wall. A lock body having a key operable tumbler cylinder is movable on said retainer and guidance bar between locking and release positions. A cabinet closure locking member or "bolt" secured to the lock body and parallel with the retainer and guidance bar and offset therefrom blocks the opening of the cabinet closure when the lock body is in the locking position.