Shane, Nicky, Kian and Mark played Croke Park for the first time last year. The band are now looking forward to their return trip on June 5, in one of the most eagerly anticipated concerts of next year.
Tickets for the concert go on sale on December 11, and are expected to be snapped up fast.
Westlife stormed to the top of the charts a few weeks ago with their new single, their first since they decided to take a year out.
The band's frontman Shane Filan said they have been "experimenting" with new music in addition to their already incredibly successful format.
"We've been experimenting with a fresh vibe on this record, working with new producers and writing songs for the album ourselves. After 11 years we see this as phase two of the Westlife story," he said.
The foursome spent most of this year hidden away in studios across Europe working with some of the most established musicmakers in the industry.
Their latest song Where We Are features work from Grammy-nominated Ryan Tedder, who has worked with superstar divas Leona Lewis and Beyonce.
The boys recently released a cover of American Idol contestant Chris Daughtry's hit What About Now to much praise, and were a massive hit when they appeared on the Late Late Toy Show last week. And the group have also been putting their writing skills to good use, as Mark Feehily just penned a song with former All Saints frontwoman Shaznay Lewis.
Their comeback has come at one of the most emotional times for the band in recent years.
Earlier this year, Kian Egan lost his father following a long illness. Dad-of-two Nicky then lost his father, Nikki, suddenly. And the band were also upset when Stephen Gately passed away unexpectedly in his home in Majorca.