A lighting device for vehicles comprising: at least one first light source defining a first optical axis along which the light source orients a light beam, a support for the light source, and a shield set in front of the light source, substantially in the proximity thereof to intercept part of the light beam; and at least one second light source defining a second optical axis parallel to the first; wherein the shield is constituted by a mask (5; 20) apt to hide, in a plane (α) perpendicular to the first optical axis, the projection in said plane of at least part of at least an edge of the light source and accordingly intercepting only a peripheral part of the light beam, situated radially externally with respect to the first optical axis, the mask (5,20) having a pre-set extension in a circumferential direction with respect to the first optical axis selected such as not to intersect the first optical axis in any event; wherein: i)- the mask (5; 20) is apt to intercept only a peripheral part of the light beam, situated laterally with respect to the first optical axis; ii)- said mask (5; 20) is arranged and shaped to intercept at least or only a part immediately adjacent to the second light source of the light beam emitted by the first light source, iii)- said mask (5; 20) is set radially between the first optical axis and the at least one second light source determining an overall optical effect equivalent to what would be obtained, in the absence of said mask, by setting at a greater distance apart the first light source from the second light source; characterized in that iv)- said first light source comprises an element for generating the light beam, optionally a possible reflector set behind the element for generating the light beam and a lens set in front of the element for generating the light beam; said mask (5; 20) being mounted on the support substantially in contact with the lens, on the side opposite to the element for generating the light beam, and covering at least part of an edge of said lens, radially external with respect to the optical axis; v)- said lighting device consists of a front optical unit, wherein the first light source is constituted by a dipped-beam headlight and the second light source is constituted by a direction indicator set alongside the dipped-beam headlight and further comprising a third light source constituted by a full-beam headlight set alongside the dipped-beam headlight, on the opposite side with respect to the direction indicator; vi)- said mask being constituted by a ring mounted around the dipped-beam headlight, substantially sharing the first optical axis and provided radially, in cantilever fashion towards the first optical axis, with a first fin and a second fin, which each have a pre-set circumferential and radial extension and are set between the first optical axis and, respectively, said second and third light sources (10, 11). i)- the mask (5; 20) is apt to intercept only a peripheral part of the light beam, situated laterally with respect to the first optical axis; ii)- said mask (5; 20) is arranged and shaped to intercept at least or only a part immediately adjacent to the second light source of the light beam emitted by the first light source, iii)- said mask (5; 20) is set radially between the first optical axis and the at least one second light source determining an overall optical effect equivalent to what would be obtained, in the absence of said mask, by setting at a greater distance apart the first light source from the second light source; characterized in that iv)- said first light source comprises an element for generating the light beam, optionally a possible reflector set behind the element for generating the light beam and a lens set in front of the element for generating the light beam; said mask (5; 20) being mounted on the support substantially in contact with the lens, on the side opposite to the element for generating the light beam, and covering at least part of an edge of said lens, radially external with respect to the optical axis; v)- said lighting device consists of a front optical unit, wherein the first light source is constituted by a dipped-beam headlight and the second light source is constituted by a direction indicator set alongside the dipped-beam headlight and further comprising a third light source constituted by a full-beam headlight set alongside the dipped-beam headlight, on the opposite side with respect to the direction indicator; vi)- said mask being constituted by a ring mounted around the dipped-beam headlight, substantially sharing the first optical axis and provided radially, in cantilever fashion towards the first optical axis, with a first fin and a second fin, which each have a pre-set circumferential and radial extension and are set between the first optical axis and, respectively, said second and third light sources (10, 11).