The Making The Band stars, consisting of Erik-Michael Estrada, Jacob Underwood, Trevor Penick and Dan Miller, announced details of their comeback last week, hinting that a tour was coming.
Now O-Town, who are reuniting without frontman Ashley Parker Angel, will be playing an intimate gig to fans at Under the Bridge in London on 13 June.
They said: "UK, it's with excitement that we can announce that we will be BACK this Summer!!! Our first show in London for over a decade! Come and hear all the hits and music from the new album for the first time!"
Jacob added: "The UK was one of the countries that really embraced O-Town and we have never forgotten that, can't wait to be back on the 13th!"
O-Town also announced three concert dates in Germany on 15, 17 and 18 June. They are expected to reveal more dates soon, telling fans today: "Don't worry to the rest of our fans, we haven't forgotten you!!!!! This is not a sprint this is a marathon."
O-Town began filming Making The Band in late 1999, when Lou Pearlman - the man behind the formation of Backstreet Boys and *NSYNC - embarked on a nationwide talent search to create a new pop group.
They disbanded in 2004 and Ashley went on to star in MTV reality show, There and Back, documenting his pursuit of solo stardom. Ashley has since continued to carve out a solo career and has also taken up small acting roles.
Last week, while the boy band thanked fans for their "incredible" support, they also said a few words about Ashley.
They tweeted: "#TBT s/o to our brother @ParkerAngel, we miss you but you will be a part of O-Town forever no matter what." Ashley replied: "Likewise!!! Love you guys."
O-Town are currently in the studio working on new material which is due for release later this year.
Tickets are available to buy from Live Nation. Pre sale stars Wednesday 9 April. General sale is on Friday 11 April.
Watch O-Town's video for 'Liquid Dreams' below: