A labelling machine for applying at least one first label (10a; 10b) onto a first article (11, 11a; 11, 11b) and at least one second label (10b; 10a) onto a second article (11, 11b; 11, 11a) respectively, characterized in that the labelling machine comprises: - a first conveyor for conveying a succession of said first articles (11, 11a; 11, 11b) and subsequent second articles (11, 11b; 11, 11a) along a path; and - a first labelling group (4; 5), which can be selectively arranged, in use, in a first operative configuration, in which it transfers said first label onto said first article (11, 11a; 11, 11b), or in a first rest configuration, in which it is prevented from transferring said first label (10a; 10b) to said first article (11, 11a; 11, 11b); - gap creating means (110; 111, 112) adapted to create a first gap, which is arranged inside said succession and is bounded between a first article (11, 11a; 11, 11b) and a second article (11, 11b; 11, 11a); and - a second labelling group (5; 4), which can be selectively moved, in use, in a second operative configuration, in which it transfers, in use, said second label (10b; 10a) to said second article (11, 11b; 11, 11a), or in a second rest configuration, in which it is prevented from transferring, in use, said second label (10b; 10a) to said second article (11, 11b; 11, 11a); and in that: said first gap is bounded upstream by an immediately adjacent said second article (11, 11b; 11, 11a) and downstream by an immediately adjacent said first article (11, 11a; 11, 11b), proceeding according to the advancing direction of said first article (11, 11a; 11, 11b) and said second article (11, 11b; 11, 11a), proceeding along said path; said labelling machine further comprises a control unit programmed for: moving, in use, said first labelling group (4; 5) from said operative configuration to said rest configuration, after said first labelling group (4; 5) has, in use, transferred said first label onto said immediately adjacent first article (11, 11a; 11, 11b) downstream of said first gap; and moving, in use, said second labelling group (5; 4) from said second rest configuration to said second operative configuration, before said second labelling group (5; 4) has transferred, in use, said second label (10b; 10a) onto said immediately adjacent second article (11, 11b; 11, 11a) upstream of said first gap. - a first conveyor for conveying a succession of said first articles (11, 11a; 11, 11b) and subsequent second articles (11, 11b; 11, 11a) along a path; and - a first labelling group (4; 5), which can be selectively arranged, in use, in a first operative configuration, in which it transfers said first label onto said first article (11, 11a; 11, 11b), or in a first rest configuration, in which it is prevented from transferring said first label (10a; 10b) to said first article (11, 11a; 11, 11b); - gap creating means (110; 111, 112) adapted to create a first gap, which is arranged inside said succession and is bounded between a first article (11, 11a; 11, 11b) and a second article (11, 11b; 11, 11a); and - a second labelling group (5; 4), which can be selectively moved, in use, in a second operative configuration, in which it transfers, in use, said second label (10b; 10a) to said second article (11, 11b; 11, 11a), or in a second rest configuration, in which it is prevented from transferring, in use, said second label (10b; 10a) to said second article (11, 11b; 11, 11a); moving, in use, said first labelling group (4; 5) from said operative configuration to said rest configuration, after said first labelling group (4; 5) has, in use, transferred said first label onto said immediately adjacent first article (11, 11a; 11, 11b) downstream of said first gap; and moving, in use, said second labelling group (5; 4) from said second rest configuration to said second operative configuration, before said second labelling group (5; 4) has transferred, in use, said second label (10b; 10a) onto said immediately adjacent second article (11, 11b; 11, 11a) upstream of said first gap.