The British band will perform two tracks on the Fox competition's results show next week.
It is not yet clear which songs Coldplay will perform on the programme, due to air May 3.
It is Coldplay's first appearance on the show.
Musical acts which have already appeared on American Idol this season include LMFAO, Jennifer Hudson, The Wanted, Nicki Minaj and Lana Del Rey.
This week's American Idol results show will air tonight (April 26) at 8/7c on Fox and feature performances from Katy Perry and Stefano Langone.
> Rihanna tour visual for Coldplay's 'Princess of China' emerges - video
Watch the video for Coldplay's 'Charlie Brown' below: