The fourth season of The Voice premiered on 28 June 2015. Ricky Martin and Joel Madden returned as coaches for the fourth season, with Madden pairing up with his brother, Benji Madden as a duo. In January 2015, it was announced that Jessie J would join the coaching line-up as well Delta Goodrem, who would return to the panel after a one-season hiatus; replacing former judges will.i.am and Kylie Minogue, respectively. This is the first season to feature two female coaches on the show. On 22 February 2015, it was announced that Sonia Kruger would be joining the fourth season as a co-host with Darren McMullen.
Ellie Drennan was declared the winner on 30 August, marking Jessie J's first and only win as coach, as well as the first female coach to win a season of the show. As of 2025, 2-chair turn contestant Drennan is the only (so far) winner in fourteen seasons not to have a 4-chair turn in the blind auditions.
This season is the last to feature Ricky Martin. He is replaced by Boyzone singer and former The X Factor Australia judge, Ronan Keating, in Season 5.
The coaches performed a cover of "Bang Bang" together at the start of the show.
The first episode of the Battle Rounds was broadcast on 19 July 2015. The coaches performed a cover of "We Will Rock You" together at the start of the show.
The second episode of the Battle Rounds was broadcast on 20 July 2015.
The third episode of the Battle Rounds was broadcast on 21 July 2015.
For the first time on The Voice, three singers from each team will go head to head in a super battle round. Each singer will sing a different song but only one will go through to the Live Shows. Prior to the Super Battles, each coach chose two of their artists to go straight through to the live shows via a fast pass.
The Super Battle round was broadcast on 26 July 2015. 8 artists were given a "fast pass" while the remaining 24 competed for 8 spots.
The first episode of the Live shows will broadcast on 2 August 2015.
The second episode of the Live shows was broadcast on 9 August 2015. In addition to the songs performed live, digital versions of the songs that the eliminated contestants in the top 16 had performed were released, these being "Flame Trees" (Cath Adams), "Everybody's Free" (Nicolas Duquemin), "A Change Is Gonna Come" (Scott Newnham) and "What I Did for Love" (Tameaka Powell).
During this week, the contestants compete for a spot in the top 4 (one per team, selected by their coach) to go directly to the second round of voting in the semi-final. The bottom 4 will have to compete in a first round where two will be eliminated. Once again, digital versions of the songs that the eliminated Top 12 contestants had performed were released, these being: "What Kind of Man" (Peta Evans-Taylor), "Feeling Good" (Gail Page), "Seasons" (Rik-E-Ragga) and "The Power of Love" (Amber Nichols).
The Semi Finals was broadcast on 23 August 2015.
The Grand Finale was broadcast on 30 August 2015