An easy mounting lock assembly (1), in which the lock (2) is of the type that comprises a frame (3) associated with the anchoring surface. A latch (4) is movable with respect to the frame (3) and is guided by the frame (3); the latch (4) is functionally associated with respective actuation lever systems (5) controlled by an actuation element. The lock assembly (1) comprises a contoured plate (7) provided with means (8) for coupling to the respective anchoring surface and provided with selective locking elements (9) for the frame (3), The frame (3) comprises elastically deformable portions (10) designed to engage detachably, in the mounting configuration, with at least one part of the locking elements (9).
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