One Love Manchester was a benefit concert and British television special on 4 June 2017, organised by American singer Ariana Grande, Simon Moran, Melvin Benn and Scooter Braun in response to the bombing after the singer's concert at Manchester Arena two weeks earlier.

Guest stars included Justin Bieber, the Black Eyed Peas,[10] Coldplay,[9] Miley Cyrus, Mac Miller, Marcus Mumford, Niall Horan, Little Mix,[6] Katy Perry, Take That, Imogen Heap, Victoria Monét, Pharrell Williams, Robbie Williams and Liam Gallagher.

[25] Following the London Bridge attack that occurred the day before the show, Greater Manchester Police announced that security would be tighter than planned.

After Heap's performance, a video of prominent Manchester footballer David Beckham reading a poem dedicated to the city was played.

Videos of other artists and celebrities, including Halsey, Bastille, Anne-Marie, Demi Lovato, Jennifer Hudson, Blossoms, Chance the Rapper, Camila Cabello, The Chainsmokers, DJ Khaled, Little Mix, Circa Waves, Kendall Jenner, Clean Bandit, Dua Lipa, Sean Paul, Nick Grimshaw, Kings of Leon, Sam Smith, Rita Ora, Shawn Mendes, Twenty One Pilots, Paul McCartney, U2 and the players of Manchester United and Manchester City declaring their solidarity with Manchester were also shown.

Liam Gallagher, lead singer of Manchester-based rock band Oasis, made a surprise appearance near the end of the concert.

[7] Television coverage on BBC One was presented by Sara Cox and Ore Oduba, with Nick Grimshaw and Anita Rani hosting from backstage and within the crowd.

The BBC announced that it would broadcast the entire concert even if it overran its intended three-hour duration,[34] which it did by approximately 20 minutes.

[81][83] 22.6 million people watched at least three minutes of the program on BBC One, making it the UK's most-watched television event of 2017.

[85] The British Red Cross received £2.35 million in donations during the three-hour concert for the We Love Manchester Emergency Fund.

[86] Grande also donated all proceeds to the fund from a re-release of her single "One Last Time" and a live audio version of "Somewhere Over the Rainbow" that she performed during the concert.

[86] Francis Wilkinson, in Bloomberg.com, wrote that Grande offered "a face that was brave and kind in the wake of terror while accomplishing several useful goals – raising money for victims, bolstering courage and making the attacks look both puny and pointless.

... She called in every favor, pulling in famous friends like Miley Cyrus and Justin Bieber to show up for the grieving city.

After meeting with a parent of one of the victims, Grande said she shifted the tone of the show from somber to celebratory because she understood that it was what her fans needed.

In what will likely go down as one of the defining moments of her career, she paused the song, looked out to her audience, which was already sobbing along with her, then resumed the music to nail yet another impossible note.

[16]In an interview with Billboard magazine, Grande's manager Scooter Braun remarked that "the city of Manchester was the hero.