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The Clique is a young adult novel series written by Canadian author Lisi Harrison and originally published by Little, Brown and Company, a subsidiary of the Hachette Group. The series was reprinted by Poppy books. The series revolves around five girls: Massie Block, Alicia Rivera, Dylan Marvil, Kristen Gregory, and Claire Lyons, who are known as The Pretty Committee. The Pretty Committee is a popular clique at the fictional, all-girls middle school, Octavian Country Day (OCD). Claire and her family move from Orlando, Florida to Westchester, New York, where they live in the Blocks' guesthouse. Claire is initially considered an outcast due to her financial and fashion status. As the series progresses, Claire slowly develops a friendship with Massie, realizing that she must earn her friendship, and eventually becomes a member of the group.

The first novel, The Clique, was released on May 19, 2004. As of June 2012, 14 novels have been released in the main series. On October 4, 2006, a box set called "The Clique Collection" was released containing the first three novels of the series. A second set was released in November 2006 containing books four through six. From April to August 2008, five novellas named after the five main characters were published in a subseries called "The Clique Summer Collection." The novellas focus on each title characters' activities during the summer between their seventh and eighth grades in school. Harrison composed a guide to the series' "teen speak" terminology and trivia, Cliquetionary, which was released on November 16, 2009. It was announced on Lisi Harrison's website that the fourteenth book (which was released February 15, 2011) would mark the end of the series.

In 2007, Warner Brothers announced that it had partnered with publisher Alloy Entertainment to create a series of direct-to-DVD films based on the books. A film, based on the first novel The Clique, was released on November 11, 2008. The novels are being adapted into a series of graphic novels by Yen Press, with the first volume released July 2010, with art by Yishan Li. The video game The Clique: Diss and Make-Up is based on the book series. The books have a spin-off series, Alphas.