The final will now be broadcast at 7.30pm on Saturday instead, when ITV had been due to show the British Soap Awards.
Grande’s One Love Manchester concert, which is being broadcast live on BBC One, will raise money for those affected by the suicide bombing last Monday at Manchester Arena.
The gig, which takes place at the Emirates Old Trafford stadium, will feature Katy Perry, Coldplay, Miley Cyrus, Take That and Usher. The Black Eyed Peas have also just been added to the line-up.
An ITV spokesperson said: “Ariana Grande’s One Love Manchester benefit concert is bringing artists and the public together and will raise funds for the Red Cross’s Manchester Emergency Fund.
“We have no desire to distract from this important cause, so we have taken the decision to move the Britain’s Got Talent Final from Sunday night.”
ITV will instead broadcast the British Soap Awards on Tuesday at 8pm.