A device for singularizing packages that are reciprocally arranged one against the other according to a linear arrangement, comprising: - a singularizing drum, which is rotatable about a rotation axis, which is preferably horizontal; - a first supplying unit, which is configured to supply packages to a delivery position at the singularizing drum; - a second supplying unit, which is configured to receive the packages that have been separated by the singularizing drum and to supply them individually to a device or machine that is set downstream of the singularizing device, wherein said first supplying unit is configured to move the packages in a row and in contact with one another along a movement path, terminating at the delivery position according to a given supplying direction, and the first supplying unit consists of a gravity conveyor designed to move the row of packages along a predetermined path, which originates from an inlet section, and ends with an outlet section at the delivery position; said drum comprises at least one first and one second projecting element, which are angularly spaced apart from each other around the rotation axis of the drum, and which are arranged, respectively, to retain the package with respect to its movement along the supplying direction, and to push the package along a direction transverse to the supplying direction and in a direction away from the rotation axis of the drum, by effect of the rotation of said drum, so as to separate the package from the other packages arranged in a row, and divert it towards the second supplying unit; said device being characterized in that the second supplying unit comprises a conveyor belt extending along a closed-loop path, and equipped along its surface with a plurality of pushing elements, wherein the second supplying unit is arranged to operate in a synchronized manner with the singularizing drum so that each package that is separated from one of the projecting elements of the drum and that is received on the second supplying unit, is pushed by a pusher element of the belt up to the downstream device or machine. - a singularizing drum, which is rotatable about a rotation axis, which is preferably horizontal; - a first supplying unit, which is configured to supply packages to a delivery position at the singularizing drum; - a second supplying unit, which is configured to receive the packages that have been separated by the singularizing drum and to supply them individually to a device or machine that is set downstream of the singularizing device, wherein said first supplying unit is configured to move the packages in a row and in contact with one another along a movement path, terminating at the delivery position according to a given supplying direction, and the first supplying unit consists of a gravity conveyor designed to move the row of packages along a predetermined path, which originates from an inlet section, and ends with an outlet section at the delivery position; said drum comprises at least one first and one second projecting element, which are angularly spaced apart from each other around the rotation axis of the drum, and which are arranged, respectively, to retain the package with respect to its movement along the supplying direction, and to push the package along a direction transverse to the supplying direction and in a direction away from the rotation axis of the drum, by effect of the rotation of said drum, so as to separate the package from the other packages arranged in a row, and divert it towards the second supplying unit; said device being characterized in that the second supplying unit comprises a conveyor belt extending along a closed-loop path, and equipped along its surface with a plurality of pushing elements, wherein the second supplying unit is arranged to operate in a synchronized manner with the singularizing drum so that each package that is separated from one of the projecting elements of the drum and that is received on the second supplying unit, is pushed by a pusher element of the belt up to the downstream device or machine.