The Delirium Trilogy is a YA fiction series by Lauren Oliver. It is set in a dystopian world where love is considered a disease called Amor Deliria Nervosa, but scientists have invented a cure for it. Everyone is supposed to get the cure when they turn eighteen and then they are matched with a partner through an evaluation.

Lauren Oliver says that the inspiration for Delirium came to her one day at the gym. She had recently read a Gabriel Garcia Márquez essay where he said that all books were about either love or death. At the gym she was watching a news report about an epidemic, and the two ideas combined in her head to form the central concept of the Delirium trilogy.

The protagonist, Lena Haloway, is looking forward to a life without love because it is "safe," but then she meets a boy named Alex Sheathes who changes her entire life. It turns out that there are rebels against the cure, and Lena gets caught up in a rebellion when she tries to escape the cure.