A safety accessory for coffee grinders-dispensers includes a substantially cylindrical sleeve having a lower annular portion insertable into the base of a grinder-dispenser, an upper annular portion engagable with the neck of a container that contains coffee beans, and an intermediate annular portion provided internally with at least one interceptor member that allows the coffee beans to move into the grinding chamber but also prevents the insertion into the grinding chamber of an element in accordance with grinder-dispenser safety regulations.