Marina & the Diamonds will play a sole date at the Emirates Stadium in London on June 1 along with Ash.
Robyn and Rita Ora will support the remainder of the dates, which include shows in London, Sunderland, Coventry and Manchester.
Meanwhile, Frank Ocean will travel with the band across Europe and open shows in Sweden, France, Poland and Germany among others.
Coldplay's forthcoming stadium tour will be in support of their fifth studio album Mylo Xyloto, which became the highest-selling record worldwide from a UK band in 2011.
> Coldplay's Chris Martin: 'We regret naming album Mylo Xyloto'
Watch the music video for Coldplay's 'Charlie Brown' below: