A machine for decorating items with granular materials, including at least one transportation device, adapted to convey the items to be decorated along a feed direction (A) and a feed orientation (V), and at least one decoration assembly of the items (P), supported above the transportation device and adapted to deposit, on the surface of each item (P), a certain quantity of granular material (M) so as to achieve a determined aesthetic effect. The decoration assembly includes a first module for dispensing adhesive fluid, of the type provided with heads with dispensing nozzles, adapted to dispense at least a first layer of adhesive fluid on the surface of the item (P) to be decorated according to a specific decorative pattern or motif, and at least one supplying device of granular material.