The dates, which were scheduled for early 2013 and included stops in London, Glasgow, Birmingham, Sheffield, Nottingham and Manchester, have been put back due to "professional and personal commitments", according to a statement from concert promoters Live Nation Global Touring.
The statement reads: "Due to professional and personal commitments Usher will have to reschedule his upcoming European tour dates.
"With the recently-confirmed commitment to The Voice, to ensure that his fans worldwide are treated to the best possible concert experience, the entire tour will be rescheduled to fall 2013 with dates in both North America and Europe scheduled to run concurrently at that time."
The rescheduled 'Euphoria' tour dates will be announced next year. Fans who have purchased tickets to the previously-scheduled dates should return their ticket for refund at point of purchase, as these tickets will not be held as valid for the rescheduled concerts.
Usher was recently announced as one of the coaches on the fourth season of The Voice in the US, along with Shakira. The pair will replace Christina Aguilera and Cee Lo Green on the show.
> Usher reveals breakdown: 'I thought I'd never perform again'
Watch the video for Usher's recent single 'Scream' below: