Mr Gately's solicitor and family friend, Gerald Kean, confirmed that the funeral will take place at noon on Saturday at St Laurence O'Toole's Church.
It is thought Gately's body could be flown home on Friday for a private wake at his family home.
X Factor judge Louis Walsh will miss Saturday night’s live show in order to attend the funeral.
Walsh has spoken publicly about his grief over the death of the Boyzone star, saying that he has lost his "best friend".
The pop guru spoke fondly of Gately saying he never let the fame go to his head.
"I have lost my best friend. He didn't change. They all changed a bit but not Stephen. He would do anything for his fans.
"He was the glue in Boyzone, he kept them all together."
Walsh had met with Gately a week before the star's death to discuss Boyzone's comeback album and said he'd never seen him happier.
"I never saw him in better health or better form. We had a laugh as usual, things were going so well. I can't believe he has gone."
Walsh also described how the other members of the band were struggling to come to terms with what has happened.
"They are all just devastated. Shane was Stephen's favourite - he loved them all but had a special place in his heart for Shane."
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