Method for feeding a strip of linerless labels to a drum for applying the labels onto containers, comprising the following steps: providing a reel of a strip of linerless labels on support means designed to allow unwinding of the strip; unwinding the strip from the reel arranged on the support means and feeding the strip downstream in an advancement direction (X-X) by means of a first motorized drive roller, wherein the first drive roller rotates in a first direction of rotation so as to unwind and advance the strip; advancing the strip to a second motorized drive roller, designed to rotate in a direction of rotation so as to advance the strip and feed it to a drum for applying and cutting the single labels; entry and exit of the unwound strip into/from a chamber arranged between the first drive roller and the second drive roller in the advancement direction (X-X) of the strip, with formation of a loop in the strip inside the chamber, the chamber having an opening in a zone where the strip passes, with opposite upstream and downstream edges; wherein along its advancing path from the reel towards the second drive roller the strip passes through a plurality of idle transmission rollers; wherein the formation of said loop in the strip inside the chamber is caused by the supply of pressurized air towards the inside of the chamber through the opening and by the operation of a first upstream roller of the chamber, motorized and rotating in the direction of rotation for advancement of the strip, and of a second downstream roller of the chamber, driven so as to rotate in the opposite direction to the first upstream roller, said upstream and downstream rollers being respectively arranged at the opposite upstream and downstream edges (101a, 101b) of the opening of the chamber; and wherein the first drive roller is arranged upstream of the chamber and is operated so as to cause continuous unwinding and advancing of the strip from the support means to the upstream roller of the chamber and the second drive roller is operated so as to cause an advancing movement of the strip with a predefined speed and tension for feeding towards the drum, between said downstream roller of the chamber and the second motorized drive roller. providing a reel of a strip of linerless labels on support means designed to allow unwinding of the strip; unwinding the strip from the reel arranged on the support means and feeding the strip downstream in an advancement direction (X-X) by means of a first motorized drive roller, wherein the first drive roller rotates in a first direction of rotation so as to unwind and advance the strip; advancing the strip to a second motorized drive roller, designed to rotate in a direction of rotation so as to advance the strip and feed it to a drum for applying and cutting the single labels; entry and exit of the unwound strip into/from a chamber arranged between the first drive roller and the second drive roller in the advancement direction (X-X) of the strip, with formation of a loop in the strip inside the chamber, the chamber having an opening in a zone where the strip passes, with opposite upstream and downstream edges; wherein along its advancing path from the reel towards the second drive roller the strip passes through a plurality of idle transmission rollers; wherein the formation of said loop in the strip inside the chamber is caused by the supply of pressurized air towards the inside of the chamber through the opening and by the operation of a first upstream roller of the chamber, motorized and rotating in the direction of rotation for advancement of the strip, and of a second downstream roller of the chamber, driven so as to rotate in the opposite direction to the first upstream roller, said upstream and downstream rollers being respectively arranged at the opposite upstream and downstream edges (101a, 101b) of the opening of the chamber; and wherein the first drive roller is arranged upstream of the chamber and is operated so as to cause continuous unwinding and advancing of the strip from the support means to the upstream roller of the chamber and the second drive roller is operated so as to cause an advancing movement of the strip with a predefined speed and tension for feeding towards the drum, between said downstream roller of the chamber and the second motorized drive roller.