The third season of La Voz Argentina premiered on 24 June 2021, on Telefe. Marley reprised his role as the host of the show, while actress Stefi Roitman became the digital host.
Soledad Pastorutti and Ricardo Montaner returned as coaches (third and second seasons respectively). Duo Mau y Ricky and Lali became new coaches for this season. For the first time in its history, the show featured a fifth coach, Emilia Mernes, who selected contestants to participate in The Comeback Stage, a digital companion series where artists eliminated from the Blind Auditions and coached by Mernes pitted in a series of Battles for a place in the Live Shows.
On 5 September, Francisco Benitez was named winner of the season, marking Soledad Pastorutti's second win as a coach.
As in the previous season, Marley became the host of the show. This season introduced actress Stefi Roitman as the digital host of the show. Returning coaches from the previous season were Venezuelan-Argentine singer and songwriter Ricardo Montaner and folk singer Soledad Pastorutti. New coaches were confirmed to be pop singer Lali and Venezuelan Latin pop and reggaeton duo Mau y Ricky. New this season, a fifth coach in charge of "The Comeback Stage" was announced. It was later revealed to be Emilia Mernes.
The battles began on 28 July 2021. The advisors for this round were Nahuel Pennisi for Team Montaner, Miranda! for Team Soledad, Nicki Nicole for Team Mau y Ricky, and Cazzu for Team Lali. In this round, each coach can steal two losing artist from another team. Artists who win their battles or are stolen by another coach advance to the Knockouts.
The knockouts round started on 10 August after the final battles. Each coach could each one losing artist from another team. The top 32 contestants move on to the playoffs.
During each of the four nights of Playoffs, the eight artists from each team performed. At the end of each round, each coach picked six artists to advance. The top 24 artists moved on to the next round. Abel Pintos served as a mega mentor during this round.
For this season, the show added a brand new phase of competition called The Comeback Stage, exclusive to MiTelefe mobile app, La Voz Argentina YouTube channel, Instagram TV, Facebook, Twitter, and Telefe.com. Fifth coach Emilia Mernes selected artists who did not turn a chair during the Blind auditions as well as eliminated artists from later rounds of the competition.
During the first round of competition, the ten selected artists went head to head, two artists per episode, and Mernes selected a winner to move on to the next round. Originally, Mernes declared seven artists as winners in their battles, but at the end of this round she had to select only four to advance.
In the second round, Mernes brought back four artists who were eliminated during the main competition Battles, giving them a chance to re-enter in the competition. These artists faced off against the four artists from the first round.
In the third round, the five remaining artists and two artists who were eliminated during the main competition Knockouts performed in front of Emilia and three were selected to perform in a fourth and final round.
The contestants performed in the first night of the round of 25 for the main competition coaches' vote, with the winner officially joining one of the four main teams. Ignacio Sagalá was declared winner with 3 out of 4 votes and he decided to join Ricardo Montaner's team.
The live shows started on 23 August and have four different rounds: Round of 25, Quarterfinals, Semifinals and Final. Public votes were introduced in the Quarterfinals.
The Finale aired on Sunday, 5 September, where the final 4 performed a solo cover song and a duet with their coach.