Pandemonium is a 2012 dystopian young adult romance novel written by Lauren Oliver and the second novel in her Delirium trilogy.

[1] The book was first published on February 28, 2012 through HarperTeen and follows the series' protagonist as she explores the Wilds outside the walled community she was raised in.

The book also follows Lena in her life while she lives in New York City with two other characters from the Wilds: Raven and Tack.

She is part of the DFA, the Deliria Free America, and during one of its rallies, she is kidnapped by other Invalids, called Scavengers, and held in captive with Julian Fineman, the leader of the youth division of the DFA.

[5][6] The Independent gave a mostly positive review, stating that although Oliver is "an adept and occasionally courageous storyteller", the story was "somewhat exhausting".