The Script frontman took to Twitter this afternoon (16 July) to break the news to fans, stating that he will now focus on the future of his band, who are currently touring the States.
He said: "I had two wonderful seasons on The Voice and, as everybody knows, I gave it my heart and soul and couldn't be more proud of the show and what we have achieved.
"My focus will be on The Script moving forward as we are about to embark on the most important part of our career as a band."
Danny was the leading mentor this year after his contestant Andrea Begley won the show.
Danny's announcement comes weeks after Jessie J confirmed that she also would not be returning for a third series of The Voice, explaining that her music had to be a "priority".
Now, coaches Tom Jones and will.i.am remain - although neither have spoken out about their future on the show.
The official BBC Twitter feed said: "Danny has been a star on #TheVoiceUK but we understand that he has to focus on his music career - The Script have a busy year ahead.
"We are very sorry to see Danny go but wish him and the band the very best and hope they will come back and perform for us next series. The full coaches' line up for the third series of #TheVoiceUK will be announced in due course."
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