Abstract: The present invention relates to an anti-theft arrangement for packaged-product vending machines that comprise a cabinet-like outer casing (2) containing the products to be vended, and provided with a product dispensing compartment that is constituted by a hopper (6) which is movable from a closed position into an opened one and vice-versa. The anti-theft arrangement comprises at least a strut (10) and an actuator (11, 12, 14) for moving the strut (10) from a first operating position, in which the strut (10) is adapted to co-operate with the hopper (6) to lock it in its closed position, to a second operating position, in which the strut (10) enables the hopper (6) to be movd into its opened position and the selected products to be withdrawn, and vice-versa. Both the strut (10) and the actuator (11, 12, 14) are housed within a containment casing (9) adapted to be attached inside the cabinet-like outer casing (2).