Abstract: A modular cabinet containing a tilt ashtray and various embodiments of a lock mechanism are disclosed.The modular cabinet and tilt ashtray comprises an exterior frame suitable for flush mounting on or projection from a wall surface, a rectangular metal cabinet rigidly mounted within said exterior frame having a pair of opposed recesses of equal width formed transversely in each of the cabinet sidewalls for receiving an ashtray having a length substantially equal to the distance between the opposed recesses for slidable insertion into the cabinet, and a door pivotally mounted on the exterior frame adapted to close the lower portion of the cabinet including the portion containing the ashtray such that the ashtray cannot be withdrawn from the cabinet when the door is closed.A lock mechanism is secured to the exterior frame flange and adapted to engage a flange or catch formed on the door.